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哲學 – 開欄文
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胡卜凱

杜蘭西洋哲學史話》不是我讀的第一本哲學書,記得在它之前我就讀過《老子》。但它是對我影響最大的幾本書之一。主要的原因是:

a.  它引起我對哲學的興趣;
b. 
奠定了我對哲學一知半解的基礎;以及
c. 
整體來說,堅定了我追求知識的決心(該欄開欄文第3)

順帶說一句:我不敢以「知識份子」自居,但頗以身為「讀書人」自豪(該欄開欄文及《目的、行動、和方法》一文);也就對兩者都有所期許(該文第4)

我不是哲學系出身;但因為對「人應該如何自處」以及「人應該如何待人接物」這兩個問題很有興趣免不了接觸到一些探討「基本問題」的書籍(請見本欄第二篇文章)。現在垂垂老矣不再有讀書的腦力;只能把過去的心得做個整理,算是收收網吧

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 回應文章
貝斯平衡點-Ed Gibney/Zafir Ivanov
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胡卜凱

下文的附標題是:「貝斯推理方法如何幫助我們在相對觀和自以為真陷阱兩者間做取捨」。文中相關術語請自行上Google搜尋。  

兩位作者在前言」部份的論述(下文前7),在討論日常生活中所說的真理」、「真」、和「信仰」等概念/詞彙的本質。如果各位不想看長篇大論的文章,或對技術性論沒啥興趣我大力推薦大家只讀這一部分。它們基本上支持我對知識的了解(此文1.1-1)小節,和此文相對觀的討)


BAYESIAN BALANCE: HOW A TOOL FOR BAYESIAN THINKING CAN GUIDE US BETWEEN RELATIVISM AND THE TRUTH TRAP

Ed Gibney & Zafir Ivanov, 04/19/24.

0. 
前言 (原文未分節,故無此子標題;下同)

On October 17, 2005 the talk show host and comedian Stephen Colbert introduced the word “truthiness” in the premier episode of his show The Colbert Report:
1 “We’re not talking about truth, we’re talking about something that seems like truth— the truth we want to exist.”2 Since then the word has become entrenched in our everyday vocabulary but we’ve largely lost Colbert’s satirical critique of “living in a post-truth world.” Truthiness has become our truth. Kellyanne Conway opened the door to “alternative facts3 while Oprah Winfrey exhorted you to “speak your truth.”4 And the co-founder of Skeptic magazine, Michael Shermer, has begun to regularly talk to his podcast guests about objective external truths and subjective internal truths, inside of which are historical truths, political truths, religious truths, literary truths, mythical truths, scientific truths, empirical truths, narrative truths, and cultural truths.5 It is an often-heard complaint to say that we live in a post-truth world, but what we really have is far too many claims for it. Instead, we propose that the vital search for truth is actually best continued when we drop our assertions that we have something like an absolute Truth with a capital T.

Why is that? Consider one of our friends who is a Young Earth creationist. He believes the Bible is inerrant. He is convinced that every word it contains, including the six days of creation story of the universe, is Truth (spelled with a capital T because it is unquestionably, eternally true). From this position, he has rejected evidence brought to him from multiple disciplines that all converge on a much older Earth and universe. He has rejected evidence from fields such as biology, paleontology, astronomy, glaciology, and archeology, all of which should reduce his confidence in the claim that the formation of the Earth and every living thing on it, together with the creation of the sun, moon, and stars, all took place in literally six Earth days. Even when it was pointed out to him that the first chapter of Genesis mentions liquid water, light, and every kind of vegetation before there was a sun or any kind of star whatsoever, he claimed not to see a problem. His reply to such doubts is to simply say, “with God, all things are possible.”
6

Lacking any uncertainty about the claim that “the Bible is Truth,” this creationist has only been able to conclude two things when faced with tough questions: (1) we are interpreting the Bible incorrectly, or (2) the evidence that appears to undermine a six-day creation is being interpreted incorrectly. These are inappropriately skeptical responses, but they are the only options left to someone who has decided beforehand that their belief is Truth. And, importantly, we have to admit that this observation could be turned back on us too. As soon as we become absolutely certain about a belief—as soon as we start calling something a capital “T” Truth—then we too become resistant to any evidence that could be interpreted as challenging it. After all, we are not absolutely certain that the account in Genesis is false. Instead, we simply consider it very, very unlikely, given all of the evidence at hand. We must keep in mind that we sample a tiny sliver of reality, with limited senses that only have access to a few of possibly many dimensions, in but one of quite likely multiple universes. Given this situation, intellectual humility is required.

Some history and definitions from philosophy are useful to examine all of this more precisely. Of particular relevance is the field of epistemology, which studies what knowledge is or can be. A common starting point is Plato’s definition of knowledge as justified true belief (JTB).
7 According to this JTB formulation, all three of those components are necessary for our notions or ideas to rise to the level of being accepted as genuine knowledge as opposed to being dismissible as mere opinion. And in an effort to make this distinction clear, definitions for all three of these components have been developed over the ensuing millennia. For epistemologists, beliefs are “what we take to be the case or regard as true.”8 For a belief to be true, it doesn’t just need to seem correct now; “most philosophers add the further constraint that a proposition never changes its truth-value in space or time.”9 And we can’t just stumble on these truths; our beliefs require some reason or evidence to justify them.10

Readers of Skeptic will likely be familiar with skeptical arguments from Agrippa (the problem of infinite regress11), David Hume (the problem of induction12), Rene Descartes (the problem of the evil demon13), and others that have chipped away at the possibility of ever attaining absolute knowledge. In 1963, however, Edmund Gettier fully upended the JTB theory of knowledge by demonstrating—in what has come to be called “Gettier problems14—that even if we managed to actually have a justified true belief, we may have just gotten there by a stroke of good luck. And the last 60 years of epistemology have shown that we can seemingly never be certain that we are in receipt of such good fortune.

This philosophical work has been an effort to identify an essential and unchanging feature of the universe—a perfectly justified truth that we can absolutely believe in and know. This Holy Grail of philosophy surely would be nice to have, but it makes sense that we don’t. Ever since Darwin demonstrated that all of life could be traced back to the simplest of origins, it has slowly become obvious that all knowledge is evolving and changing as well. We don’t know what the future will reveal and even our most unquestioned assumptions could be upended if, say, we’ve actually been living in a simulation all this time, or Descartes’ evil demon really has been viciously deluding us. It only makes sense that Daniel Dennett titled one of his recent papers, “Darwin and the Overdue Demise of Essentialism.”15

So, what is to be done after this demise of our cherished notions of truth, belief, and knowledge? Hold onto them and claim them anyway, as does the creationist? No. That path leads to error and intractable conflict. Instead, we should keep our minds open, and adjust and adapt to evidence as it becomes available. This style of thinking has become formalized and is known as Bayesian reasoning. Central to Bayesian reasoning is a conditional probability formula that helps us revise our beliefs to be better aligned with the available evidence. The formula is known as Bayes’ theorem. It is used to work out how likely something is, taking into account both what we already know as well as any new evidence. As a demonstration, consider a disease diagnosis, derived from a paper titled, “How to Train Novices in Bayesian Reasoning:”

1. 
貝斯平衡點的應用 (原文未分節,故無此子標題)

1.0
概述

10 percent of adults who participate in a study have a particular medical condition. 60 percent of participants with this condition will test positive for the condition. 20 percent of participants without the condition will also test positive. Calculate the probability of having the medical condition given a positive test result.
16

Most people, including medical students, get the answer to this type of question wrong. Some would say the accuracy of the test is 60 percent. However, the answer must be understood in the broader context of false positives and the relative rarity of the disease.

Simply putting actual numbers on the face of these percentages will help you visualize this. For example, since the rate of the disease is only 10 percent, that would mean 10 in 100 people have the condition, and the test would correctly identify six of these people. But since 90 of the 100 people don’t have the condition, yet 20 percent of them would also receive a positive test result, that would mean 18 people would be incorrectly flagged. Therefore, 24 total people would get positive test results, but only six of those would actually have the disease. And that means the answer to the question is only 25 percent. (And, by the way, a negative result would only give you about 95 percent likelihood that you were in the clear. Four of the 76 negatives would actually have the disease.) 

Now, most usages of Bayesian reasoning won’t come with such detailed and precise statistics. We will very rarely be able to calculate the probability that an assertion is correct by using known weights of positive evidence, negative evidence, false positives, and false negatives. However, now that we are aware of these factors, we can try to weigh them roughly in our minds, starting with the two core norms of Bayesian epistemology: thinking about beliefs in terms of probability and updating one’s beliefs as conditions change.17 We propose it may be easier to think in this Bayesian way using a modified version of a concept put forward by the philosopher Andy Norman, called Reason’s Fulcrum.18

1.1

Figure 1. A Simple Lever. Balancing a simple lever can be achieved by moving the fulcrum so that the ratio of the beam is the inverse of the ratio of mass. Here, an adult who is three times heavier than the child is balanced by giving the child three times the length of beam. The mass of the beam is ignored. Illustrations in this article by Jim W.W. Smith (
請至原網頁參看圖片)

Like Bayes, Norman asserts that our beliefs ought to change in response to reason and evidence, or as David Hume said, “a wise man proportions his belief to the evidence.”19 These changes could be seen as the movement of the fulcrum lying under a simple lever. Picture a beam or a plank (the lever) with a balancing point (the fulcrum) somewhere in the middle, such as a playground teeter-totter. As in Figure 1, you can balance a large adult with a small child just by positioning the fulcrum closer to the adult. And if you know their weight, then the location of that fulcrum can be calculated ahead of time because the ratio of the beam length on either side of the fulcrum is the inverse of the ratio of mass between the adult and child (e.g., a three times heavier person is balanced by a distance having a ratio of 1:3 units of distance).

If we now move to the realm of reason, we can imagine substituting the ratio of mass between an adult and child by the ratio of how likely the evidence is to be observed between a claim and its counterclaim. Note how the term in italics captures not just the absolute quantity of evidence but the relative quality of that evidence as well. Once this is considered, then the balancing point at the fulcrum gives us our level of credence in each of our two competing claims.

1.2

Figure 2. Ratio of 90–10 for People Without–With the Condition. A 10 percent chance of having a condition gives a beam ratio of 1:9. The location of the fulcrum shows the credence that a random person should have about their medical status. (
請至原網頁參看圖片)

To see how this works for the example previously given about a test for a medical condition, we start by looking at the balance point in the general population (Figure 2). Not having the disease is represented by 90 people on the left side of the lever, and having the disease is represented by 10 people on the right side. This is a ratio of 9:1. So, to get our lever to balance, we must move the fulcrum so that the length of the beam on either side of the balancing point has the inverse ratio of 1:9. This, then, is the physical depiction of a 10 percent likelihood of having the medical condition in the general population. There are 10 units of distance between the two populations and the fulcrum is on the far left, 1 unit away from all the negatives.

1.3

Figure 3. Ratio of 18 False Positives to 6 True Positives. A 1 to 3 beam ratio illustrates a 25 percent chance of truly having this condition. The location of the fulcrum shows the proper level of credence for someone if they receive a positive test. (
請至原網頁參看圖片)

Next, we want to see the balance point after a positive result (Figure 3). On the left: the test has a 20 percent false positive rate, so 18 of the 90 people stay on our giant seesaw even though they don’t actually have the condition. On the right: 60 percent of the 10 people who have the condition would test positive, so this leaves six people. Therefore, the new ratio after the test is 18:6, or 3:1. This means that in order to restore balance, the fulcrum must be shifted to the inverse ratio of 1:3. There are now four total units of distance between the left and right, and the fulcrum is 1 unit from the left. So, after receiving a positive test result, the probability of having the condition (being in the group on the right) is one in four or 25 percent (the portion of beam on the left). This confirms the answer we derived earlier using abstract mathematical formulas, but many may find the concepts easier to grasp based on the visual representation.

To recap, the position of the fulcrum under the beam is the balancing point of the likelihood of observing the available evidence for two competing claims. This position is called our credence. As we become aware of new evidence, our credence must move to restore a balanced position. In the example above, the average person in the population would have been right to hold a credence of 10 percent that they had a particular condition. And after getting a positive test, this new evidence would shift their credence, but only to a likelihood of 25 percent. That’s worse for the person, but actually still pretty unlikely. Of course, more relevant evidence in the future may shift the fulcrum further in one direction or another. That is the way Bayesian reasoning attempts to wisely proportion one’s credence to the evidence.

1.4

Figure 4. Breaking Reason’s Fulcrum. Absolute certainty makes Bayes’ theorem unresponsive to evidence in the same way that a simple lever is unresponsive to mass when it becomes a ramp. (
請至原網頁參看圖片)

What about our Young Earth creationist friend? When using Bayes’ theorem, the absolute certainty he holds starts with a credence of zero percent or 100 percent and always results in an end credence of zero percent or 100 percent, regardless of what any possible evidence might show. To guard against this, the statistician Dennis Lindley proposed “Cromwell’s Rule,” based on Oliver Cromwell’s famous 1650 quip: “I beseech you, in the bowels of Christ, think it possible that you may be mistaken.”20 This rule simply states that you should never assign a probability of zero percent or 100 percent to any proposition. Once we frame our friend’s certainty in the Truth of biblical inerrancy as setting his fulcrum to the extreme end of the beam, we get a clear model for why he is so resistant to counterevidence. Absolute certainty breaks Reason’s Fulcrum. It removes any chance for leverage to change a mind. When beliefs reach the status of “certain truth” they simply build ramps on which any future evidence effortlessly slides off (Figure 4).

So far, this is the standard way of treating evidence in Bayesian epistemology to arrive at a credence. The lever and fulcrum depictions provide a tangible way of seeing this, which may be helpful to some readers. However, we also propose that this physical model might help with a common criticism of Bayesian epistemology. In the relevant academic literature, Bayesians are said to “hardly mention” sources of knowledge, the justification for one’s credence is “seldom discussed,” and “Bayesians have hardly opened their ‘black box’, E, of evidence.”21 We propose to address this by first noting it should be obvious from the explanations above that not all evidence deserves to be placed directly onto the lever. In the medical diagnosis example, we were told exactly how many false negatives and false positives we could expect, but this is rarely known. Yet, if ten drunken campers over the course of a few decades swear they saw something that looked like Bigfoot, we would treat that body of evidence differently than if it were nine drunken campers and footage from one high-definition camera of documentarians working for the BBC. How should we depict this difference between the quality of evidence versus the quantity of evidence?

We don’t yet have firm rules or “Bayesian coefficients” for how to precisely treat all types of evidence, but we can take some guidance from the history of the development of the scientific method. Evidential claims can start with something very small, such as one observation under suspect conditions given by an unreliable observer. In some cases, perhaps that’s the best we’ve got for informing our credences. Such evidence might feel fragile, but…who knows? The content could turn out to be robust. How do we strengthen it? Slowly, step by step, we progress to observations with better tools and conditions by more reliable observers. Eventually, we’re off and running with the growing list of reasons why we trust science: replication, verification, inductive hypotheses, deductive predictions, falsifiability, experimentation, theory development, peer review, social paradigms, incorporating a diversity of opinions, and broad consensus.22

We can also bracket these various knowledge generating activities into three separate categories for theories. The simplest type of theory we have explains previous evidence. This is called retrodiction. All good theories can explain the past, but we have to be aware that this is also what “just-so stories” do, as in Rudyard Kipling’s entertaining theory for how Indian rhinoceroses got their skin—cake crumbs made them so itchy they rubbed their skin until it became raw, stretched, and all folded up.23

Even better than simply explaining what we already know, good theories should make predictions. Newton’s theories predicted that a comet would appear around Christmas time in 1758. When this unusual sight appeared in the sky on Christmas day, the comet (named for Newton’s close friend Edmund Halley) was taken as very strong evidence for Newtonian physics. Theories such as this can become stronger the more they explain and predict further evidence.

1.5

Finally, beyond predictive theories, there are ones that can bring forth what William Whewell called consilience.
24 Whewell coined the term scientist and he described consilience as what occurs when a theory that is designed to account for one type of phenomenon turns out to also account for another completely different type. The clearest example is Darwin’s theory of evolution. It accounts for biodiversity, fossil evidence, geographical population distribution, and a huge range of other mysteries that previous theories could not make sense of. And this consilience is no accident—Darwin was a student of Whewell’s and he was nervous about sharing his theory until he had made it as robust as possible.

Figure 5. The Bayesian Balance. Evidence is sorted by sieves of theories that provide retrodiction, prediction, and consilience. Better and better theories have lower rates of false positives and require a greater movement of the fulcrum to represent our increased credence. Evidence that does not yet conform to any theories at all merely contributes to an overall skepticism about the knowledge we thought we had. (請至原網頁參看圖片)

Combining all of these ideas, we propose a new way (Figure 5) of sifting through the mountains of evidence the world is constantly bombarding us with. We think it is useful to consider the three different categories of theories, each dealing with different strengths of evidence, as a set of sieves by which we can first filter the data to be weighed in our minds. In this view, some types of evidence might be rather low quality, acting like a medical test with false positives near 50 percent. Such poor evidence goes equally on each side of the beam and never really moves the fulcrum. However, other evidence is much more likely to be reliable and can be counted on one side of the beam at a much higher rate than the other (although never with 100 percent certainty). And evidence that does not fit with any theory whatsoever really just ought to make us feel more skeptical about what we think we know until and unless we figure out a way to incorporate it into a new theory.

2. 
結論

We submit that this mental model of a Bayesian Balance allows us to adjust our credences more easily and intuitively. Also, it never tips the lever all the way over into unreasonable certainty. To use it, you don’t have to delve into the history of philosophy, epistemology, skepticism, knowledge, justified true beliefs, Bayesian inferences, or difficult calculations using probability notation and unknown coefficients. You simply need to keep weighing the evidence and paying attention to which kinds of evidence are more or less likely to count. Remember that observations can sometimes be misleading, so a good guiding principle is, “Could my evidence be observed even if I’m wrong?” Doing so fosters a properly skeptical mindset. It frees us from the truth trap, yet enables us to move forward, wisely proportioning our credences as best as the evidence allows us.


Zafir Ivanov is a writer and public speaker focusing on why we believe and why it’s best we believe as little as possible. His lifelong interests include how we form beliefs and why people seem immune to counterevidence. He collaborated with the Cognitive Immunology Research Initiative and The Evolutionary Philosophy Circle. Watch his TED talk.

Ed Gibney writes fiction and philosophy while trying to bring an evolutionary perspective to both of those pursuits. He has previously worked in the federal government trying to make it more effective and efficient. He started a Special Advisor program at the U.S. Secret Service to assist their director with this goal, and he worked in similar programs at the FBI and DHS after business school and a stint in the Peace Corps. His work can be found at evphil.com.

References

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https://rb.gy/ms7xw
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https://rb.gy/erira
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https://rb.gy/96p2g
6. 
https://rb.gy/f9rj3
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https://rb.gy/5sdni
8. 
https://rb.gy/zdcqn
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https://rb.gy/3gke6
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https://rb.gy/1no1h
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https://rb.gy/eh2fl
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https://rb.gy/2k9xa
13. Gillespie, M. A. (1995). Nihilism Before Nietzsche. University of Chicago Press.
14.
https://rb.gy/4iavf
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https://rb.gy/crv9j
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https://rb.gy/zb862
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https://rb.gy/dm5qc
18. Norman, A. (2021). Mental Immunity: Infectious Ideas, Mind-Parasites, and the Search for a Better Way to Think. Harper Wave.
19.
https://rb.gy/2k9xa
20. Jackman, S. (2009). The Foundations of Bayesian Inference. In Bayesian Analysis for the Social Sciences. John Wiley & Sons.
21. Hajek, A., & Lin, H. (2017). A Tale of Two Epistemologies? Res Philosophica, 94(2), 207–232.
22. Oreskes, N. (2019). Why Trust Science? Princeton University Press.
23.
https://rb.gy/2us27
24. Whewell, W. (1847). The Philosophy of the Inductive Sciences, Founded Upon Their History. London J.W. Parker


This article appeared in Skeptic magazine 28.4
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「觀念論」是一種「現實論」 - Jeremy Dunham
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胡卜凱

我連躺椅上的哲學家都說不上或許這就是何以我在下文中看不到支持作者標題這個命題、他第一段論述和他第二兩段論述等三者的論點」。

或許,這篇文章的標題應該改為:《黑格爾觀念論簡介》。


Idealism is Realism

Thoughts are more real than objects

Jeremy Dunham, 04/19/24

編者前言

Idealism is often met with some ridicule; surely the world doesn't just exist in our heads. Jeremy Dunham argues this view of idealism is a misconception. Idealism is a much more realist worldview than we think, and more realist than its alternatives, as it does not deny the existence of the most real things there are: thoughts.


What is idealism? Throughout history, in most cases, philosophical idealism is a metaphysical position. The idealist is concerned with reality’s fundamental nature. It is often mistakenly thought to be a reductive theory of the fundamental nature of reality. Many critics have supposed that the idealist tries to reduce reality to the subjective states of individual minds. According to this form of subjective idealism there is no world outside our minds. This view is often associated with the British empiricist
Bishop Berkeley (1685-1753). Famously, when told that such idealism was irrefutable, the English author Samuel Johnson 1709-1784) shouted, “I refute it thus” and kicked a stone. The idealist therefore is thought to be the one who denies. They are anti-realist, anti-materialist, anti-naturalist, and certainly anti-stones.

This way of thinking about philosophical idealism is misleading. Many kinds of philosophers have both voluntarily and involuntarily been referred to as idealists. However, they are united by an understanding of idealism as a form of
realism. Idealism is not a reductive philosophy. It argues for the real existence of elements of reality often dismissed. It is a realism about ideas. Even Berkeley frames his position as a realism. He wrote that “the real things are those things I see, and feel, and perceive by my senses”.

Berkeley opposed his view to those who regard our rich conscious
phenomenal world, the world of tastes, feels, colours, and sounds, as in some way less real than the physical world. For Berkeley, the real stone is the coloured object which we see and feel and that resists us when kicked. If Johnson kicked the stone as hard as I imagine, he entered a world of pain. For Berkeley, this world is the real world. His idealism is ampliative, not reductive. Its aim is to account for the full extent of our reality. Berkeley, then, is not anti-stone. He argued that only idealism can do justice to stones.

Although idealism may refer to a doctrine that affirms the reality of our ideas in this subjective sense, there is another sense of the word ‘idea’. This is the
Platonic Idea, often referred to as ‘Form’ or ‘Universal’. Idealism shares something in common with the modern philosophical view known as Platonism. But there are significant differences. Platonists defend the existence of universals in addition to particular properties. A Platonist about properties, for example, believes that in addition to the individual things in the world that have redness amongst their properties, such as the red pen in front of me and the red symbols on my computer screen, there is the universal redness. This universal isn’t in front of me. It doesn’t exist anywhere in space or time. It is an abstract object. An abstract object is neither physical nor mental. It is causally inert, fixed, and unchanging. Yet, when we see redness in the world, this redness is an exemplification or instantiation of that universal. Particular red things are united by the fact that they instantiate this universal. Accordingly, the modern Platonist seems to postulate two worlds. One of abstract objects and another in which they are instantiated. However, since the abstract objects are causally inert, the relationship between these worlds is mysterious.

One of the most important schools of idealism in its history is that known as absolute idealism. It originates with Hegel in Germany, but flourished towards the end of the nineteenth-century with many adherents in the Oxbridge philosophy departments and worldwide. Here, the idea in idealism explicitly refers to Plato’s ideas. However, the absolute idealist attempts to bring the two worlds described above together into one. Consequently, the abstract universal is made concrete.

In several places, Plato suggests that things have the properties they do in virtue of participating in the Idea (or universal). A beautiful thing is beautiful in virtue of the fact that it participates in the Idea of beauty. However, this suggests that the particulars stand in a causal relationship with the universals. Ideas are causally responsible for the existence of properties in the concrete world. Perhaps we are wrong to think of Plato’s Ideas as abstract objects after all? Abstract universals are causally inert, so whatever relationship there is between them and their instantiating particulars, it cannot be causal. This is the absolute idealist’s starting point. The universals do not exist outside of our world. They are immanent to it. They are not abstract, rather they are concrete. As
Hegel claimed, since the living world is concrete not abstract, those who consider universals as abstract kill the living thing.

This kind of idealist argues that our world has the structure or form that it does because of the universals immanent to it. Hegel
wrote that “The universal is the essential, true nature of things” and that “through thinking these over we become acquainted with the true nature of things”. Any individual bear, for Hegel, has a universal nature. It’s that aspect of its nature it shares with any other bear and thus enables us to identify it as a bear, even if we’ve never seen this individual bear before. But it is also different to every other bear. It has particular features that distinguish it from any other bear and make it an individual.

Crucially, in the case of the concrete universal, the particular features that make an individual the individual it is are not external to the universal but rather contained within it. You do not get the individual bear by bundling a bunch of extra particulars to the universal bear. Hegel dedicates much of his famous
Phenomenology of Spirit to demonstrating that if you start with properties that are only externally related, it’s impossible to combine them together into the kind of unities that make up our world. A bear isn’t a bundle of qualities. It’s a self-preserving organism for which the parts depend on the whole as much as the whole depends on the parts. Its particular properties, like the thickness of its fur, are different in the winter than in the summer because they are internally related to the organism as a whole and sensitive to its survival needs.

What does it mean to say that the concrete universal contains particulars within itself? It means that the individual bear becomes the individual bear not by addition, but by negation. To think the abstract universal, you abstract away all the properties that differentiate one bear from another and the universal is whatever is left. The concrete universal, on the other hand, includes all those differences. The particularisation of the bear is the process by means of which it negates the properties that do not belong to it, leaving behind just those that make it the individual bear.

This is the meaning behind Hegel’s often quoted phrase: all determination is negation. ‘The true, infinite universal’,
Hegel writes, ‘determines itself… it is creative power as self-referring absolute negativity. As such, it differentiates itself internally’. This points to an important characteristic of the concrete universal: it determines the development of the individual. The universal guides the bear’s ideal development. It should develop from a cub to a yearling and then from a young adult to a mature adult. However, it develops in its own particular way. Although all bears develop from cub to yearling, only this individual cub developed in this particular way. The thought is that if you took away from the universal every particular way that the bear might develop leaving us with the abstract universal consisting of just the features all bears share, you’re actually left with nothing. Certainly, you’re left with nothing living. You’ve murdered the living thing.

According to the most prominent contemporary metaphysical readings of Hegel, such as
Robert Stern’s, the concrete universals should be understood as similar to Aristotelian substance kinds. This means that there are as many concrete universals as there are individuals to instantiate them. Emily is the individual human she is because she is a self-particularising concrete universal. However, the absolute idealists who dominated the British philosophical world towards the end of the nineteenth century believed that all these concrete universals were ultimately interrelated as parts of one all-encompassing concrete universal.

For the nineteenth-century British idealist Bernard Bosanquet, the perverse thing about abstract universals is that the wider their extension is, the less there is to them. This is because you get the universal giant panda when you abstract everything particular away from every individual giant panda. Then, to get the universal bear, you must abstract all the features that particularise it as one of its particular species of bear, like giant panda. To get the universal mammal you then abstract all the features that make each animal a mammal rather than a reptile, bird, or fish. The more things that supposedly instantiate a universal, the sparser the features of that universal are.

On the contrary, the logic of the concrete universal,
Bosanquet says, does violence to the ‘inverse ratio of intention to extension’. There is not less to the universal animal than there is to the universal bear, rather there is more because the universal animal contains bear within it and a whole host of other animals too. It’s the most substantial Noah’s ark you can imagine. However, if bears are part of a higher universal of mammals and mammals are part of a higher universal of animals, why stop there? Couldn’t there be a universal ‘living thing’? And perhaps one above that? For Bosanquet, this is exactly right. We keep going until we end up with just one concrete universal, the absolute Idea, the world as a whole. For Bosanquet this is ‘a system of members, such that every member, being ex hypothesi distinct, nevertheless contributes to the unity of the whole in virtue of the peculiarities which constitute its distinctness’. In agreement with the Aristotelian reading of idealism, each individual is the self-particularising of the concrete universal, but, ultimately, it’s one and the same concrete universal self-particularising in various different ways.

The result of this is that we owe our individuality to a larger whole in which we are all systematically related and which relates us to each other in a fundamental way. Earlier I claimed that many people incorrectly regard idealism as a philosophy that is characterised by the things that it is against. However, here we find something that this kind of idealist really is anti: the idea of fundamental separateness. This has significant ethical implications. The most important absolute idealist of the twenty-first century,
Timothy Sprigge (1932-2007), wrote that absolute idealism’s main message is that ‘we are nearer the core of things when we partly transcend it [our separateness] in cooperative ethical, cultural, and intellectual endeavours and in mutual aid’.  

Idealism is a label that has been used to refer to a huge variety of different philosophical positions. I’ve focused on metaphysical versions to show how different idealism is from its common misconceptions. Idealism is not a reductive philosophy but an inflationary one. Idealism aims to do justice to the full extent of the characteristics of the world in which we live. Any thorough-going realism, any realism that takes every feature of our world seriously, must be a realism about the idea.

Many of the ideas in the article were developed in collaboration with Iain Hamilton Grant and Sean Watson when we wrote our 2011 Idealism book together. I’m also very grateful for many conversations with Robert Stern since then which have improved my understanding of the concrete universal. Thanks also to Joe Saunders and Emily Thomas for their comments on an earlier draft.


Jeremy Dunham is an Associate Professor in Philosophy at the University of Durham.


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0.  前言

韓最克斯先生所介紹形塑西方思想7本著作中(請見本欄),我對Dialogue of Pessimism無印象PoemsOn Nature、和Lives and Opinions of the Eminent Philosophers三本則在了解古希臘思想的閱讀過程中應該看到它們被提及或引用(古代哲學-1956古希臘1-1979古希臘2-1981)。我沒有讀過Discourses of Epictetus奧瑞尼亞斯的《沉思錄》則在15歲那年讀過(該文第1.1小節);所以,我對斯多噶學派的思想略有所知Republic一書有點冗長,我大概只重點式的讀了1/3到一半7本著作中,我唯一讀完的只有The Nicomachean Ethics;已經是40多年前的事了

1.  讀後

1)  在漢默拉比法典之外,我對巴比倫的了解大概就數空中花園巴柏塔寓言、和《舊約》所記載的一些歷史或軼事。讀了此文才知道巴比倫文化也是哲學的發源地,和以「對話形式」來進行「論述」的開山老祖。

2)  瑟拉芬尼斯「人以自己的形象造神」的說法相當睿智;他認為「神即宇宙」的想法,應該和儒家、道家的學說有相通之處。

3)  我對帕門奈迪斯思想的認識,主要來自《柏拉圖對話錄》一書中的《帕門奈迪斯篇》。以我當時的英文程度和哲學水準,應該連「一知半解」都說不上。韓最克斯先生的大作提到帕氏:The world we interact with is not the “true reality but only a set of appearances.” 這個看法;我想它和唯識宗「萬法唯識」,以及《金剛經》「凡所有相皆是虛妄」的觀點可說「所見略同」。

4)  韓最克斯先生在介紹亞里斯多德的倫理學思想時,提及「德性論」「效益論」、和「義務論」三大學派。我個人傾向「效益論」。15歲時我根據在雜誌上一篇介紹「效益論」的文章寫了《效果論》,主張以它當做「行為準則」。一個月後我就發現該文有一個嚴重的困難「效果」有長期和短期之分;也有小我和大我之分。所以,「效果」(或「效益」)不能高居「行為」的指導綱領。我將在討論倫理學時進一步表達拙見。

2. 
結論

「學而不思則罔,思而不學則殆。」

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11 philosophers you don't know about, but should

Martha Nussbaum, Carlo Rovelli and other philosophers draw the short list.

IAI Editorial, 11/14/23

For World Philosophy Day 2023, eleven leading thinkers nominate philosophers you probably haven't heard of, but you should know about, from Ancient Greece all the way to the present day. Martha Nussbaum, Carlo Rovelli, Cheryl Misak, Peter Adamson, Andrew Bowie, Tommy J Curry, Emily Thomas, Paul Giladi, Maria Balaska, Sara Heinämaam, Hugo Drochon and Sophie-Grace Chappell put forward their choices.

Martha C. Nussbaum

Porphyry (c. 234 - c. 305 CE)

A Neoplatonic philosopher born in Tyre, and later living at Rome, who wrote in Greek.  He wrote the best work in the entire history of Western philosophy before the twentieth century on the intelligence and complex sentience of nonhuman animals and the cogent reasons for not killing and eating them. Called "On Abstaining from Eating Animals," it is a very lengthy work and survives in its entirety. An English translation by Gillian Clark was published in 2000 by Cornell University Press.

Martha C. Nussbaum is Distinguished Service Professor of Law and Ethics at the University of Chicago and one of the world’s most celebrated moral philosophers, according to the Financial Times.

Carlo Rovelli

Anaximander of Miletus, 5th century BCE

Anaximander is a giant of human thinking, standing at one of the deep roots of modernity and is very little known.  He is the one that realized the first cosmological revolution, understanding that the sky above us continues below us and the Earth is a big stone floating in the void.  This is the discovery of the worldview that will characterize the West for centuries, the birth of cosmology, and is the first scientific revolution. It is the discovery that scientific revolutions are possible: in order for us to understand the world, we must be aware that our current worldview may be mistaken, and we can redraw it.  He is the first geographer.: the first to draw geographical maps.  The first biologist, contemplating the possibility that living beings evolved over time. He is the first astronomer, making a rational study of the movements of heavenly bodies and seeking to reproduce them with a geometrical model. He is the first to propose two conceptual tools that would prove fundamental to scientific activity: the idea of natural law, guiding the unfolding of events over time and by necessity; and the use of theoretical terms to postulate new entities, hypostases used to make sense of the observable world. He starts the critical tradition that forms the basis of today’s scientific thinking: he follows his master Thales's path while at the same time searching for his master’s mistakes.  He created what the Greeks called Peri phuseos istoria (hence “physics”), the “inquiry into nature,” giving birth to a tradition that would form a deep root basis for the entire scientific development to come.  Even the literary form of this tradition, a treatise in prose, starts with him.

Carlo Rovelli is an Italian theoretical physicist and loop quantum gravity pioneer. He is the author of, many bestselling books, including The Order of Time, Reality Is Not What It Seems, and Anaximander.

Maria Balaska

Cora Diamond (1937 - )

Asking ‘What do women want in a moral theory?’, Annette Baier in 1985 included Cora Diamond in her list of women philosophers who spoke 'in a different voice from a standard moral philosopher's voice'. Since then many years have passed and Cora Diamond has been giving us more and more samples of that voice. At a time where so many philosophers still put forward a view of ethics as a series of calculations, mapped on endless versions of trolley problems, it is imperative that we listen to a voice that can teach us differences, as Wittgenstein had hoped for. From her early thought-provoking 'Eating Meat and Eating People' to her more recent discussions on the nature of truth in ethics (what should we make of the statement 'Slavery is wrong'?), Diamond keeps bringing philosophy face to face with what she calls 'difficulties of reality'. This is where philosophy begins.

Maria Balaska is a research fellow at the University of Hertfordshire and at Åbo Akademi University. She is the author of Wittgenstein and Lacan at the limit: meaning, and astonishment, and the editor of Cora Diamond on Ethics.

Peter Adamson

Fakhr al-Din al-Razi (1150 - 1210 CE)

A formidable theologian and philosopher who responded in great detail to the ideas of the more famous Ibn Sina (Avicenna, who died in 1037). Al-Razi is well known in the Islamic world as the author of a massive commentary on the Quran but also wrote many works detailing his disagreements, and occasional agreements, with Ibn Sina. He had innovative things to say on pretty much every area of philosophy, for instance by challenging Ibn Sinā on points of logic, developing a new conception of metaphysics, and arguing for a consequentialist ethics. It's especially interesting to see how he weaves together ideas from Avicennan philosophy with doctrines from Islamic theology. He was also very influential, and was quoted for centuries in later Islamic philosophy.

Peter Adamson is Professor of Ancient and Medieval Philosophy at King’s College London, and Professor of Philosophy in Late Antiquity and the Islamic World at Ludwig Maximilan University of Munich. He is the host of the podcast History of Philosophy Without Any Gaps.

 Cheryl Misak

Frank Ramsey (1903 – 1930)

Frank Ramsey died at the age of 26, too young to have personally influenced generations of students. But his importance is legendary. He was at least Wittgenstein’s equal in philosophy and a major influence on his difficult friend. In philosophy, we have Ramsey Sentences, Ramsey Conditionalization, and much more. A fruitful branch of combinatoric mathematics is named after him. He founded two branches of economics and, in figuring out how to measure degrees of belief, laid the basis for contemporary economics and social science.

His life was as exciting. He began his Cambridge undergraduate degree just as the Great War was ending; he was part of the race to be psychoanalyzed by Freudians in Vienna; and he was in with the Bloomsbury set of writers and artists. Virginia Woolf described him ‘as something like a Darwin, broad, thick, powerful, & a great mathematician, & clumsy to boot.’ As if that weren’t enough, he had important things to say about (socialist) politics and the (atheist) meaning of life.

Cheryl Misak is University Professor and Professor of Philosophy, University of Toronto, and author of, among other books, Frank Ramsey: A Sheer Excess of Powers.

Andrew Bowie

Friedrich Daniel Ernst Schleiermacher (1768 - 1834)

Schleiermacher is well known as a key founder of modern Protestant theology, but in the Anglophone world he is still not widely known for his philosophical insights into language, that presage key ideas present in Wittgenstein, Habermas, Brandom, and others, let alone his views on aesthetics, and ethics. These ideas emerge particularly through his concern with interpretation as fundamental to human existence. He sees interpretation as an ‘art’, which is ‘that for which there admittedly are rules, but the combinatory application of these rules cannot in turn be rule-bound’. This leads him to a rejection of foundational forms of epistemology: the ‘completion’ of episteme is ‘coming to an understanding’, which is ‘an art techne’. It is ‘an activity’ and episteme and techne ‘are the same’. As such, ‘the art of finding principles of knowledge can be none other than our art of carrying on conversation’. This leads him to a rejection of the analytic/synthetic distinction: the ‘difference therefore just expresses a different state of the formation of concepts’. By taking issues present in aesthetics as central to philosophy he offers an alternative approach to modern philosophy which has not been adequately appreciated.

Andrew Bowie is Emeritus Professor of Philosophy and German at Royal Holloway, university of London, and author of, most recently, Aesthetic Dimensions of Modern Philosophy.

Tommy J. Curry

Jean-Louis Vastey (1781 - 1820)

Also known as Pompée Valetin, Baron de Vastey, he authored The Colonial System Unveiled in 1814. This book analysed the colonial endeavours of Europe broadly as a system of ideological claims driven by greed. Vastey explained: “When Europeans came to the new world, their first steps were accompanied by crimes on a grand scale, massacres, the destruction of empires, the obliteration of entire nations from the ranks of the living”. Baron de Vastey argued that Europe’s economic and intellectual advances were not based on its superior white civilization but on its unbridled genocide and violence against darker races. Baron de Vastey claimed that Europe’s Enlightenment was rooted in racist pseudo-sciences dedicated to advancing slavery and colonialism against the humanity of African and Indigenous peoples and greed, not knowledge.  

Baron de Vastey’s philosophy explored topics of historiography, ethnology, and Black self-determination that laid the foundation of normative Black political theory and decolonial ethics well into the early 20th century. 

Tommy J. Curry is an American scholar, author and professor of philosophy, holding a Personal Chair in Africana philosophy and Black male studies at the University of Edinburgh. He is the author, most recently, of Another White Man's Burden: Josiah Royce's Quest for a Philosophy of White Racial Empire.

Emily Thomas

Constance Naden (1858 – 1889)

Constance Naden is well-known as a Victorian poet, but she was also a philosopher. During the 1880s, she drew on the science of her day to controversially defend atheism and materialism. I read Naden as arguing that, whilst we only directly know the contents of our own minds, we should believe that outside our minds lies matter. And, as neuroscience shows our brains deeply affect our minds, we should believe our minds are made of matter. To give a flavour of Naden’s work, take her 1882 “Animal Automatism”. It attacks evolutionist T. H. Huxley for advocating a kind of ‘phenomenalism’, on which matter depends for its existence on our minds. Against this, Naden turns Huxley’s own evolutionary theories against him. “Unless his views have recently undergone a marvellous change,” Naden writes, “the earth was in being very long before the appearance of any sentient organism”, and “mind is developed from matter”. Mind, indeed life itself, evolved in the distant past from non-living matter. So matter must exist independently of us.

Emily Thomas is Professor of Philosophy at the University of Durham, and author, most recently, of a book on Victoria Welby.

Paul Giladi

Enrique Dussel (1934 - 2023)

Dussel was arguably the most important philosopher from South America born in the 20th century. Though rarely (if at all) featured and discussed in mainstream Anglo-American and continental European philosophical circles, he was a prolific writer and world-leading figure in the articulation and propagation of liberation theology.

Dussel is also known for developing the radical and challenging concept of ‘transmodernity’. Throughout his life’s work on this difficult subject, Dussel argued that transmodernity is a way of producing both a lifeworld (a set of values that are formative for developing society, personality, and culture) and economic systems that transcend the Global North-centric conflict between modernity and postmodernity. Transmodern thinking and institutional design operate under an ‘ana-dialectic’ or ‘analecticlogic, which moves critical theory and political economy beyond the Frankfurt School and Foucault, and instead centres the voices, epistemologies, and vocabularies of ideologically-marginalised Global South communities.

Dussel famously wrote that a “project of ‘trans’-modernity, a ‘beyond’ that transcends Western modernity (since the West has never adopted it but, rather, has scorned it and valued it as “nothing”) … will have a creative function of great significance in the twenty-first century”. Given how the Global South is currently posing concrete challenges to the Global North’s hegemony, Frantz Fanon’s vision of a ‘critical humanism’ produced by the Global South may start to materialise in no small part due to Dussel’s work.

Paul Giladi is a university lecturer in philosophy at the School for Oriental and African Studies, co-founder of the Naturalism, Modernity, Civilization and International Research Network. He is the co-editor of Epistemic Injustice and the Philosophy of Recognition.

Sara Heinämaa

Aurel Kolnai (1900 - 1973)

Aurel Kolnai’s phenomenology of disgust is still the best philosophical analysis of the emotion that we have. Via various readings, it influenced many 20th century theories of revulsion and nausea, but also ingenious artistic presentations of the emotion in paining and cinema. Most importantly Salvador Dali and, via Dali, also Alfred Hitchcock, drew from Kolnai’s insights. Similarly Kolnai’s analysis of game-behavior still operates as a secret source of many 21st century contributions in philosophy of games. Its distinctions help us understand what is at issue in ice hockey and boxing but also in virtual games, war games and chess. Finally, Kolnai’s early analysis of Nazism, The War Against the West (1938), illuminates new totalitarian ideologies that are mushrooming in our own time. The unifying topic of all Kolnai’s contributions is the question how willing and feeling combine in human behavior. We would do well if we were to attend to his alert.

Sara Heinämaa is Professor of Philosophy, University of University of Jyväskylä and President of the Philosophical Society of Finland. She is the author of Toward A Phenomenology of Sexual Difference.

Hugo Druchon

Vilfredo Pareto (1848 - 1923)

Italian economist, sociologist, and philosopher, Pareto is perhaps best known for 80/20 rule - the thesis that 80% of wealth will always belong to 20% of the population, in an early rending of the 1% vs the 99%. He is worth revisiting today to help us understand the political era of populism we are still in the midst of.  Populism pits a pure people against a corrupt elite. Yet most populist leaders are themselves elites. Trump is part of the financial 1% and was a TV star (The Apprentice) before coming to the White House. Boris Johnson is as establishment as they get: Eton, Oxford. Here, Pareto’s ‘circulation of elites’ thesis can come in handy. Pareto saw politics as the competition between ‘lions’ and ‘foxes’ (both expressions of the elite): lions more inclined towards centralised and faith-based rule, foxes in support of decentralisation and scepticism. Maybe another way to interpret the politics of the last while is to think of it as a circulation from foxes to lions? 

Hugo Drochon is Associate Professor of Political Theory at the University of Nottingham, and author of the book Nietzsche's Great Politics.

Sophie-Grace Chappell

Aurel Kolnai (1900 - 1973)

I don’t know if people haven’t heard of Aurel Kolnai (1900-1973)—perhaps they have—but he is certainly someone whose work deserves more attention. He was an ethical philosopher who began with experience, not with systematic theories or grands récits, and whose influences included Aquinas, Husserl, G.K.Chesterton, Scheler, and British “common sense” philosophy. He himself was an influence on Bernard Williams, David Wiggins, Isaiah Berlin, and Vaclav Havel. As someone outside the “analytic mainstream”, and as a Jewish Catholic philosopher from Austria-Hungary in the time of the Nazis, he had great difficulty throughout his life in securing a conventional job in academic philosophy. But his writings, with their scepticism both about totalitarianism in politics and about what Levinas calls totalisation in philosophy, are of permanent value—and given that he wrote an anti-Nazi reflection with the title The War Against The Westperhaps have a particular resonance at our present unfortunate point in history.

Sophie-Grace Chappell is a Professor of Philosophy at the Open University, who writes about ethics, politics, feminism and epistemology. Her books include Ethics Beyond the Limits, Knowing What To Do, and Ethics and Experience. Her most recent book is the edited collection Intuition, Theory, and Anti-Theory in Ethics, published in 2015.

SUGGESTED READING World Philosophy Day: 13 questions for our centuryBy IAI Editorial
SUGGESTED READING 15 Ideas that Inspired the World’s Leading ThinkersBy IAI Editorial
SUGGESTED READING 10 questions ignored by philosophyBy IAI Editorial



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7 philosophy books that shaped Western thought

Dive into seven texts that continue to shape Western philosophy, from ancient Mesopotamia to Greece's brightest minds.

Scotty Hendricks, 09/11/23

KEY TAKEAWAYS

*  These seven philosophical texts have shaped the contours of Western thought, delving into questions of justice, existence, and human nature
*  While celebrated works such as Plato's Republic offer insights into justice and reality, lesser-known pieces like the Mesopotamian Dialogue of Pessimism illuminate ancient perspectives on life's absurdities
*  Collectively, these writings underscore the rich tapestry of ideas that have laid the foundation for contemporary philosophical discourse.

Books possess a unique magic: With only ink and paper, they can communicate thoughts from a person who is separated from you by thousands of years and unfathomable cultural space. For some particularly original thinkers, this has allowed mere fragments of text to influence the course of human thought for thousands of years. The following seven influential philosophy books have helped shape the intellectual history of the Western world and, more recently, the entire planet.

Dialogue of Pessimism — Unknown author

Ancient Greece is the culture most associated with philosophy. However, it is wrong to think that nobody else studied it. Plato himself wrote about Egypt’s long philosophical history, for example. Unfortunately, however, there is precious little surviving philosophy that originated across the rest of the Mediterranean and Mesopotamian worlds. 

One of the surviving texts is the 
Dialogue of Pessimism. It exists in two similar forms: one Assyrian and one Babylonian. While parts of both are fragmentary, it is the best-preserved example of Mesopotamian “wisdom texts.” Framed as a dialogue between two characters, an Aristocrat and his Slave, the text consists of the Aristocrat proposing ideas for things to do to the Slave, who provides good reasons for them. The Aristocrat then proposes opposing ideas, yet the Slave is just as easily able to defend those. The last few lines reflect on the absurdity of life. Many interpretations of this exist. Some suggest it is a precursor to modern existentialist thought, particularly that of Camus or Søren Kierkegaard. It is easy to see that from the final lines of the text:

“Slave, listen to me!
Here I am, master, here I am! 
What then is good? To have my neck and yours broken, or to be thrown into the river, is that good? 
Who is so tall as to ascend to heaven? Who is so broad as to encompass the entire world? 
 O well, slave! I will kill you and send you first! 
 Yes, but my master would certainly not survive me for three days!”

Babylonian thought is so foundational that its influence is often overlooked. We still use Babylonian units to measure time. Their astronomers laid the foundations for both modern astronomy and science itself. And it is speculated that many Greek thinkers, such as 
Thales, were influenced by Babylonian thought. The Dialogue of Pessimism is thought to have influenced biblical texts, particularly Ecclesiastes, and can be viewed as a forerunner of Plato’s Socratic Dialogues.

Poems — Xenophanes

The first pre-Socratic philosopher with a considerable amount of extant writing samples for us to review is 
Xenophanes. Unlike many of his contemporaries, he wrote many different books and poems. Enough fragments of his work survive to give us something beyond later commentary. While a full picture of his thoughts is impossible to form, what does exist demonstrates why he was one of the most influential pre-Socratic philosophers. 

Xenophanes is principally known for his theology. He argued that common conceptions about the gods in the Greek world were mistaken. His view of God was spherical: lacking human traits, and perhaps directly identifiable with the Universe. While there is some debate around his exact wording, he may have been the first Western monotheist, or arguably even pantheist. He mused that humans tended to give their gods familiar traits:

“Thracians that theirs are blue-eyed and red-haired. But if horses or oxen or lions had hands or could draw with their hands and accomplish such works as men, horses would draw the figures of the gods as similar to horses, and the oxen as similar to oxen, and they would make the bodies of the sort which each of them had.”

His principal philosophical legacy lies in his approach to epistemology and skepticism. While he argued for the existence of objective truths, he doubted the ability of humans to ascertain them. He noted that our beliefs were limited by our knowledge and used this as evidence for how little we can truly know:

“If god had not made yellow honey [we] would think that figs were much sweeter.”

The skeptics of the ancient world would claim him as a critical influence. However,
recent interpretations lean toward Xenophanes’ warning against dogmatic approaches or claims to certainty rather than a hard-line skeptic position. In either case, his writings are among the first to consider the problem of how we can claim to know anything — a problem people still grapple with today. 

On Nature — Parmenides

Parmenides is one of the most important ancient philosophers you’ve never heard about. Working in Elea, a Greek colony in what is now southern Italy, he wrote a 
single book that exists only in fragmented quotations and later authors’ commentaries. Through these, he has impacted virtually all subsequent Western philosophy

While the name was 
probably a later invention — On Nature was a commonly applied name for works describing the Universe — Parmenides’ poem is one of the most important texts in Greek philosophy. In it, he invented metaphysics and contributed to logic by laying out his arguments with deductive rigor. Unlike his predecessors — famed for arguing that the world was made of a single, physical element — Parmenides argued that the world is a single, unchanging substance and that our notions of motion, change, creation, and destruction are all mistaken. The world we interact with is not the “true reality but only a set of appearances. He also maintains that empty space is impossible since the idea of “nothing” is contradictory

 In his words:

“…the only routes of inquiry that are for thinking: the one, that it is and that it is not possible for it not to be, is the path of Persuasion (for it attends upon Truth), the other, that it is not and that it is right that it not be, this indeed I declare to you to be a path entirely unable to be investigated: For neither can you know what is not (for it is not to be accomplished) nor can you declare it. For the same thing is for thinking and for being.”

Parmenides’ legacy is 
vast. His work directly influenced Plato, who argued that the world we engage with is a mere copy of the world of “forms.” Through Plato, Parmenides impacted nearly all of subsequent Western philosophy. His ideas on time and space continue to influence modern debates. 

Discourses of Epictetus — Flavius Arrian 

Epictetus was a Stoic philosopher in the Roman Empire during the second century. Born in what is now Turkey, he was enslaved and owned by Emperor Nero’s secretary at one point. While in servitude, he began receiving an education in Stoic philosophy from Musonius Rufus. After his freedom was restored, he was banished to Greece, where he founded a well-regarded school. Known for teaching Stoicism as a way of life rather than just a pure philosophy, he was well-known in his day — some sources suggest he was more famous than Plato was during his lifetime

Discourses is a series of polished notes from post-lecture discussions. It was likely written by his student, Flavius Arrian. While the exact length of the original text remains unknown, some sources suggest there were eight books in the complete set. Today we have four. These cover a wide range of topics relatable to anyone at any time and present Stoicism as a guide to life rather than a dry philosophy. One of the more famous quotes expresses why a person should bother to study at all:

“For on these matters we should not trust the multitude who say that none ought to be educated but the free, but rather to philosophers, who say that the educated alone are free.”

Discourses is one of the earliest records we have of the thoughts of a Stoic thinker. Marcus Aurelius held it in high regard and quoted it in Meditations. It was also the source for 
The Handbook, an introduction to Stoic philosophy aimed at popular audiences, also likely penned by Arrian. This book has proven popular, especially during increases in the popularity of Stoic thought.

Republic — Plato

Plato’s Republic is arguably one of the most famous works in philosophy. Framed as a discussion between Socrates and several others about the nature of justice, it provides us with some of the most enduring philosophical arguments and images. 

Socrates addresses the idea of justice by analogy, using the concept of a “just city” to understand how justice impacts the soul. His perfect city has attracted a great deal of attention over the millennia. Along the way, he considers how acquiring knowledge is like leaving a dark cave, what exactly love is, the differences between reality and the world we engage with, and what would happen if you gave a man a magic ring that turned him invisible. 

Many lines from 
Republic have become widely known. One particularly famous example is:

The punishment which the wise suffer who refuse to take part in the government, is to live under the government of worse men.”

The influence of Republic cannot be overstated. It has influenced thinkers from Plato’s student Aristotle to those working in the field today. It remains the most widely read book at 
American Universities. The “utopia” it describes has been used as a framework for the eponymous book. It has also been argued, but not proven, that Plato’s Ring of Gyges may have influenced Tolkien’s One Ring

The Nicomachean Ethics — Aristotle

One of the most important books on ethics ever written — 
The Nicomachean Ethics — is Aristotle’s attempt to determine what the good life is and how to live it

His answer is a system of 
virtue ethics. His notion of virtue is that of a median point between two vices. For example, courage is seen as the midpoint between the vices of rashness and cowardice. Exactly what these things look like at the moment will vary, meaning that virtue requires serious study, practice, and work. He admits this and goes so far as to suggest that a good life requires making habits of the virtues so they can be practiced regularly. This is entirely needed, because, as he puts it:

“…one swallow does not make a summer, nor does one day; and so too one day, or a short time, does not make a man blessed and happy.”

While other systems eclipsed 
Aristotelian Ethics in popularity, virtue ethics is currently enjoying a major resurgence in popularity. Philosophers are reconsidering virtue ethics to avoid the problems in utilitarian and deontological ethical systems

Lives and Opinions of the Eminent Philosophers — Diogenes Laërtius

The last inclusion on this list is the strangest. 
The Lives and Opinions of the Eminent Philosophers is a text by Diogenes Laërtius, written in the 3rd century C.E. The book covers many famous Greek philosophers’ personal lives and ideas. Modern scholars tend to agree that it is not the most reliable source, that its author tends to focus on minor details to the detriment of telling us what his subjects thought, and that the contradictions in it make it clear that parts of it must be wrong.

While on its own merits, the book might be considered of limited value, it’s crucial when considering the loss of many primary ancient texts. Diogenes Laërtius documented the lives and thoughts of Greek philosophers without much critique, offering a likely unbiased glimpse into their worlds. Our modern understanding of many Greek philosophers owes much to this text, making it indispensable in the study of ancient thought. 


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我對哲學的了解
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0.  前言

承【天上人間】版主樂樂山水網友徵召,要我協助八反(三反五反)大師處理哲學板的事務,雖然自己覺得資格不足,但用服務熱誠,應該可以彌補一、二。所以很高興來當個志工。

八反大師的遊戲規則和建議,我都贊成。歡迎大家各抒己見,培養批判性思考的習慣和能力。

這裏先簡單談談我對哲學的了解;第1節以後再進入正題。

在日常生活中,「哲學」一詞至少有三個不同的「意義」或「用法」:

1)
指一種人生觀。
2)
指一個人觀察世事時的一些基本立場,或下判斷時所依據的一些基本假設。
3)
指一門學問。

但哲學不是聊天,也不是隨想,更不是人云亦云。

人生觀、基本假設、和知識或學問都是由淺入深,由個案到一般。一個人要經過獨立「思考」的過程,或「質疑」的步驟,才能建立「自己」的觀點。還記得「學而不思則罔」這句話嗎?

1. 
傳統西方哲學

如果跳過哲學史和字源派對「哲學」的解釋,依一般西方的哲學論述,我們可以說:

哲學思考最基本問題活動

最基本的問題原來只有兩個:

宇宙是什麼?
人是什麼?

為了回答這兩個問題,又加上第三個基本問題:

知識是什麼?

為了回答這個問題,又加上第四個基本問題:

語言和思想的本質是什麼?

因此,傳統西方哲學,分成四個獨立的領域:

1)  形上學

2)  倫理學
3)  認識論
4)  語言哲學(19世紀末、20世紀初以後新增)

我們在各學科領域中,常常看到「科學『哲學』「大腦神經學『哲學』「經濟學『哲學』「次學門」的名稱。我認為這類名詞翻譯相當誤導,因為它們不符合「」的標準如果用「基礎論」取代「哲學」一詞,它們的意思就很清楚了。以「科學『基礎論』」為例,顧名思義,表示這個「次學門」鑽研的是「科學研究的對象「科學研究的『方法論』「科學研究所使用到的『基本概念』、以及「何以研究科學是可能的?等等課題

2.  (
西方)哲學領域今後的走向

一般而言,形上學就是本體論(如海德格),沙特則分別兩者。本體論包含宇宙學。希臘人談宇宙學的不多。基督教得勢以後,宇宙學變成神學。上帝創造宇宙所以,只要證明上帝存在,宇宙學的問題就解決了。十七世紀以後,宇宙學屬於科學(物理學和各種天文學)的領域。

今天本體論是高能物理學的領域;宇宙學則是高能物理學和天文物理學的領域。如果不了解和它們相關的理論,一般學者對這兩個領域無從置喙。

認識論則成了認知科學。哲學家要了解腦神經學、當代演化論、和電腦科學(如人工智慧)的理論,才能言之有物的談認識論。

哲學家需要具備有關演化心理學(1)、腦神經心理學、和各種社會科學(如社會學和人類學)的基本理論,才能有根有據的談倫理學。

同樣的,哲學家需要了解演化心理學、腦神經心理學、和各種社會科學的基本理論,才能探討語言和思想的起源和本質。

這也是各種後現代理論興起的社會因素之一:

傳統哲學家必須開拓/他們新的論述場域。否則,失去講台也就使她/他們的謀生技藝被「取消」了。

3. 
中國哲學

在我淺薄的了解,提升自己的「修養」是過去中國哲學的一個研究重點。是否如此,要請懂中國哲學的朋友來談。中國哲學當然不一定要依西方哲學的定義和議題來分類。但中國哲學家必須回答以下三個問題:

1)
如何劃分哲學非哲學之間的界線?
2)
劃分的依據(或理論)是什麼?
3)
中國哲學的研究方法是什麼?

4. 
補充說明

4.1
形上學的字意

以上三節中,我並無意故弄玄虛,把哲學搞得高不可攀的模樣。摘錄三段舊作,做個註解。

McKeon教授的解釋,形上學的意思如下:

當安卓尼卡斯(羅德島)編輯亞力斯多德的著作時,他把亞氏關於第一哲學(或基本原理)的著作,放在關於物理學(physics)著作的後面,並名之為metaphysics("meta"在希臘文的字意是「在 ... 之後」。)

安氏的用意很明白:要先了解現象,才能研究它們的道理。

4.2
哲學的功能是在知識上承先啟後

此處談談哲學的未來。如果我們把哲學的功能當做在知識上承先啟後;也就是孔子說的「集大成」;而不是黑格爾或海德格所認為的「奠基」;哲學就沒有「終結」與否的困擾。如我常常說的,求知的目的在解決問題。人類只要生活下去,就要不斷的解決問題。「問題」通常來自人們的「無知」;所以,人類只要想活下去,「求知」的工作就不會停止。從而,哲學家也就要不斷的做承先啟後的工作:

綜合已有的成果,分析當下面對的問題,以及建議未來探索的方向。

由於20世紀的知識爆炸,未來的哲學家如果不調整她/他的知識基礎,的確有被「終結」的可能。因此,我建議哲學系增加下列學科的概論或入門課程:

領域-------------必修課程

本體論-----------近代物理、量子力學、宇宙學
認識論-----------電腦科學、近代物理、大腦神經學
---------------------(
認知、演化、社會)心理學
倫理學------------文化人類學、(生物、演化、社會)心理學

三個領域的共同必修課程則是基因學和統計學。

以上我所列舉的這些「必修課程」,就相當於2,300年前安卓尼卡斯時代的(亞氏)「物理學」。今天的認識論,用安卓尼卡斯的術語來說,就是meta-neuroscience。倫理學則是meta-neuro-psychologymeta-evolutionary-psychology、和meta-social-psychology

4.3  
神經心理學家談認識論

赫布
博士是建立神經心理學的學者之一。當前對「記憶」的研究工作有幾個不同的方向,他對「記憶」的觀點,是其中的一個指導理論。他在一篇論文中有一段談到認識論的話,和我以上的觀點相合;節譯如下:

「第二,我要強調研究知識原理的認識論一直都包含著許多生理學和心理學的理論,一些古老的、過時的、現在看起來荒謬的理論。 ... 20世紀的認識論如果基於17世紀的生理學和19世紀的心理學,它不可能是一個健全的理論,更別說找尋到「真理」了。... 我最後要強調:一個哲學家如果不清楚當前心理學的研究成果,他/她將無法提出一個完整的認識論。...(2)

最後,順帶介紹msn社群中兩個談哲學,一個談社會學的網址:

【查拉圖斯特拉如是說】
Reading Networkers
【街頭社會學】


後記:

本文原稿寫於2003年,分別發表在我的部落格和msn的【天上人間】。第二次修訂在2009(增加第4.3小節)。這次增加了「前言」中的一部分,加上一些超連接,並略做編輯;但全文主體沒有重大修正。

我不記得msn網站在那一年吹的熄燈號;也不清楚上述三個網頁是否轉移陣地繼續開張。總之,msn熄燈後我不曾再拜訪過它們。今天在網上搜尋了一下,找到近於【街頭社會學】的【巷仔口社會學】;可惜沒有找到另外兩個網頁或部落格。有可能是我的搜尋功夫太遜。

2010
之後年老力衰,勉強維持這個城市都感到力不從心。回想起來,倒是很懷念65歲前天天飆網,到處拜碼頭、打擂台的樂趣。

附註:

1.
我現在對演化心理學」相當存疑,主要是因為我偶而讀到一些它的論文或研究報告,往往有邏輯」和「基本假設」上的問題(存疑1存疑2)
2.
原文為:”Secondly, I assert that epistemology, the theory of knowledge, has always had in it a large element of physiological and psychological theory, ancient, outmoded, and now preposterous theory. ... A twentieth century epistemology cannot be good, let alone arrive at "truth", if it is made up largely of a seventeenth-century physiology and a nineteenth-century psychology. ... and I now assert, finally, that any form of epistemology is incompetent if it is uninformed about current psychological development, ...” (Hebb 1982p. 88)

參考資料:

Hebb, D. O., 1982, Buchtel, H. A., ed., The Conceptual Nervous System, Pergamon Press, Oxford, England


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