Introduction to Philosophy. Instructor: Jason Sheley

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1 Introduction to Philosophy Instructor: Jason Sheley

2 Classics and Depth Before we get going today, try out this question: What makes something a classic text? (whether it s a work of fiction, poetry, philosophy, etc)

3 Meditation 6

4 In Meditation 6, Descartes says he will show that material things exist, and that the mind and body are distinct. This is also an opportunity to take stock and ask ourselves to what extent Descartes has been successful overall.

5 Descartes begins Meditation 6 by noting two things 1) If I clearly and distinctly perceive something, God is such as to make it so By distinguishing the imagination from the intellect

6 What does Descartes say about the mind s ability to distinguish a triangle from a chiliagon? (Notice that this is also a false-start. Why can t he prove the existence of the body from the fact that the imagination exists?)

7 Triangle vs. Chiliagon

8 On p. 41 Descartes lays out his plan...

9 Remember, whenever I clearly and distinctly perceive that two things are distinct, God is such as to make it so that this is the case Therefore, the mind and body are really distinct.

10 How the Mind and Body are Distinct On p we get the argument What happens when I think of mind? What happens when I think of body?

11 Mind Thinking non-extended

12 Bodies Extended non-thinking

13 How does the argument for the distinction between mind and body go?

14 Some views on the relationship between mind and body From Richard Taylor, Metaphysics

15 The mind is a thinking, non-extended thing. The body is an extended, non-thinking thing. Question: how do they interact with each other?

16 Pineal Gland, Bodily Thinking

17 The Sailor and the Ship p. 45 By means of these sensations of pain, hunger, thirst, and so on, nature teaches that I am present in my body not merely in the way a sailor is present in a ship, but that I am most tightly joined, and, so to speak, commingled with it, so much so that I and the body constitute one single thing.

18 Next we get the argument for the existence of material things. How does this argument go? (And does it remind you of any other arguments we have seen in the Meditations?)

19 From Meditation 3... nor heat be introduced into a subject which was not already hot unless it is done by something that is of at least as perfect an order as heat...

20 From Meditation 3... but it is also true that there can be in me no idea of heat, or of a stone, unless it is placed in me by some cause that has at least as much reality as I conceive to be in the heat or in the stone.

21 Here is a question to consider: The argument for the existence of corporeal things seems to mirror the argument for the existence of God in Meditation 3. Why is Descartes not able to also conclude that material things exist in Meditation 3?

22 How Bodily Errors Occur What it means to be taught something by nature p. 46

23 Ethics with Descartes

24 Descartes compares the structure of knowledge to a tree... Ethics Medicine Mechanics Physics Metaphysics

25 The Hellenistic Schema Step 1: Understand the nature of the Universe Step 2: (based on step 1) Understand the nature of human beings in relationship to the world Step 3: derive conclusions about the good for human beings by understanding step 1 and step 2

26 For more on Descartes conception of Ethics, see: descartes-ethics/

27 Let's compare another philosopher...

28 Descartes Hume

29 Section II - Of the Origin of Ideas...The most lively thought is still inferior to the dullest sensation.

30 Two classes: Two classes: Thoughts or Ideas -- marked as less lively, often also marked as reflections upon the Impressions. Impressions -- I mean... all our more lively perceptions, when we hear, or see, or feel, or love, or hate, or desire, or will.

31 Examples of each "A picture naturally leads our thoughts to the original..." "the mention of one apartment in a building naturally introduces an inquiry or discourse concerning the others..."..."and if we think of a wound, we can scarcely forebear reflecting on the pain that follows it."

32 A B

33 That the sun will not rise tomorrow is no less intelligible a proposition, and implies no more contradiction than the affirmation, that it will rise. We should in vain, therefore, attempt to demonstrate its falsehood. Were it demonstratively false, it would imply a contradiction, and could never be distinctly conceived by the mind.

34 I shall venture to affirm, as a general proposition, which admits of no exception, that the knowledge of this relation is not, in any instance, attained by reasonings a priori; but arises entirely from experience, when we find that any particular objects are constantly conjoined with each other.

35 Let an object be presented to a man of ever so strong natural reason and abilities; if that object be entirely new to him, he will not be able, by the most accurate examination of its sensible qualities, to discover any of its causes or effects. Adam, though his rational faculties be supposed, at the very first, entirely perfect, could not have inferred from the fluidity and transparency of water that it would suffocate him, or from the light and warmth of fire that it would consume him.

38 The key question is, how do we acquire knowledge of cause and effect in this case?

We have said that all arguments concerning existence are founded on the relation of cause and effect; that our knowledge of that relation is derived entirely from experience; and that all our

39 We have said that all arguments concerning existence are founded on the relation of cause and effect; that our knowledge of that relation is derived entirely from experience; and that all our experimental conclusions proceed upon the supposition that the future will be conformable to the past. To endeavour, therefore, the proof of this last supposition by probable arguments, or arguments regarding existence, must be evidently going in a circle, and taking that for granted, which is the very point in question.

40 You say that the one proposition is an inference from the other. But you must confess that the inference is not intuitive; neither is it demonstrative: Of what nature is it, then? To say it is experimental, is begging the question. For all inferences from experience suppose, as their foundation, that the future will resemble the past, and that similar powers will be conjoined with similar sensible qualities.

41 Custom, then, is the great guide of human life. It is that principle alone which renders our experience useful to us, and makes us expect, for the future, a similar train of events with those which have appeared in the past. Without the influence of custom, we should be entirely ignorant of every matter of fact beyond what is immediately present to the memory and senses. We should never know how to adjust means to ends, or to employ our natural powers in the production of any effect. There would be an end at once of all action, as well as of the chief part of speculation.

42 What, then, is the conclusion of the whole matter? A simple one; though, it must be confessed, pretty remote from the common theories of philosophy. All belief of matter of fact or real existence is derived merely from some object, present to the memory or senses, and a customary conjunction between that and some other object. Or in other words; having found, in many instances, that any two kinds of objects flame and heat, snow and cold have always been conjoined together; if flame or snow be presented anew to the senses, the mind is carried by custom to expect heat or cold, and to believe that such a quality does exist, and will discover itself upon a nearer approach.

43 Matters of Fact Cause and Effect Experience Custom/Habit

David Hume ( )

David Hume ( ) David Hume (1711-1776) was one of the most brilliant thinkers of the Enlightenment, and paradoxically, it was his rigorous employment of the solid, critical reflection so prized by the Enlightenment philosophers