Midterm Flashcards

1
Q

philosophy

A

comes from two Greek words, ‘Philein’ (to love, or ‘Philos,’ love) and ‘Sophia’ (wisdom). So philosophy means ‘love of wisdom’ and philosophers are ‘lovers of wisdom.

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2
Q

What do we mean by wisdom?

A

Wisdom, according to Dr. Johnson, involves devoting one’s attention to matters of “fundamental and perennial significance.”

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3
Q

Some say that philosophers deal with the “Big Questions”

A

According to Dr. Johnson, Philosophy can be broken down into parts, or sub-disciplines. These sub-disciplines “are distinguished from each other by the kind of question they ask.” The three parts are:

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4
Q

Descriptive Philosophy

A

It attempts to answer the question ‘What is the nature of reality?’ It attempts to understand and describe the universe as it is. Descriptive philosophy is also called metaphysics.

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5
Q

‘Metaphysics’ comes from the Greek words ‘meta ta Physika,’

A

(meta, ‘after, above, beyond’ and physika ‘nature or having to do with nature.’)

Some of the questions dealt with by metaphysics are ‘What is the basic substance of the universe ?’ or ‘Is there more than one substance?’ Metaphysics subsumes ontology (onta, Gr., has to do with Being or existence). Ontology deals with questions concerning ‘real’ existence. For example,

‘Does God exist?,’ ‘Does the soul exist?,’ ‘Do numbers exist?,’ ‘What sort of existence could the soul or numbers have?,’ ‘What do we mean by ‘real’ existence?,’ ‘Are there really cause-effect relationships?’

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6
Q

Normative Philosophy

A

s concerned with norms and standards. It doesn’t intend to describe, it intends to evaluate. I like to say that normative philosophy deals with what ‘ought to be’ rather than what is. Normative philosophy includes; ethics politcal philosophy, aesthitics

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7
Q

Ethics-

A

ethics (or morality) deals with questions of right and wrong, good and bad. But it also deals with the questions of ‘How ought we to live?,’ ‘What is the good life?,’ ‘How can I achieve happiness?,’ How do I attain tranquility of mind?”.

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8
Q

Political Philosophy

A

‘What is the best sort of social organization for humans?’ ‘ Can the state justify itself?’ ‘Which functions should the state perform?,’ etc.

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9
Q

Aesthetics-

A

Aesthetics deals with such questions as ‘What is art?,’ ‘Must art be beautiful?,’ ‘What is beauty?,’ ‘Should art appeal to reason or to emotions?,’ etc.

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10
Q

Critical Philosophy-

A

. Logic, Epistemology

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11
Q

Logic

A

from the Greek word ‘Logos’ (account, word, reason, rational principle that governs the universe and more.) Logic deals with cogent reasoning, the rules of inference, validity and soundness, evaluation of arguments, etc.

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12
Q

Epistemology

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or theory of knowledge. The word ‘epistemology’ comes from the Greek ‘episteme’ which means ‘knowledge.’ Epistemology deals with such questions as ‘What is truth?,’ What makes something true?,’ ‘What is knowledge?,’ ‘How does knowledge differ from strong belief?,’ ‘What can human beings know?’ ‘Can we know anything?,’ etc.

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13
Q

Arguments:

A

An argument consists of at least two statements, one of which provides evidence, or support, for the other.

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14
Q

Statements:

A

sentences or phrases that can be true or false.

Examples

The sentence ‘What time is it?’ is not a statement because it cannot be true or false.

The sentence ‘It is 3 o’clock’ is a statement.

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15
Q

Premise

A

(the statement[s] that offer evidence or support)

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16
Q

Conclusion

A

(the statement[s] that is [are] being supported.

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17
Q

Valid arguments

A

valid arguments have a form such that if (assuming that) the premises are true, the conclusion is guaranteed to be true. In other words, the conclusion necessarily follows from the premises.
(You can have a valid argument with false premises and a false conclusion, for example

All cows are purple

Socrates is a cow

So, Socrates is purple)

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18
Q

Soundness

A

A sound argument has a valid form and true premises.

We will be reading and analyzing many arguments during the quarter. If I ask you to explain a philosopher’s argument, you must explain the premises as well as the conclusion.

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19
Q

Empiricism

A

empiricists believe that knowledge begins with sense experience and observation of the world. If we had no sense experience, our minds would be a tabula rasa [blank slate

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20
Q

Rationalism-

A

rationalists believe that knowledge does not come by sense experience. Knowledge is attained by means of reason, logic, and perhaps, innate ideas.

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21
Q

Skepticism

A

A critique of our ability to attain knowledge. The word ‘skepticism’ comes from the Greek ‘skeptesthai’ meaning, to consider, examine, inquire.
A true skeptic cannot assert that we cannot know anything. Why?
One of the ancient skeptics Pyrrho of Elis (c. 365-275 BCE). He was the founder of the school.

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22
Q

The Outlines of Pyrrhonism

Sextus Empiricus (c. 150-220 CE/AD)

A

This work is a manual for skeptics.

Sextus begins by explaining what skeptics do and why they do it. Skeptics set out ‘oppositions,’ that is, opposing beliefs, accounts, assertions in response to any beliefs, accounts, assertions, etc. [P. 135]

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23
Q

Epoche

A

or suspension of judgment. They hope that epoche’ will lead to tranquility of mind, or “quietude.” [P. 135.] Skeptics are not “dogmatists” that is, they do not claim to know the truth about non-evident things. The skeptics do not deny appearances (the way things appear to be, e.g., honey appears sweet, they do not deny that they feel cold, if they do feel cold. This allows skeptics to live a regular life, according to appearances.)

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24
Q

The Ten Modes

A

help to bring about Epoche]

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1st Mode
(you do not have it) based on the differences among animals. Various animals have different sorts of sense organs. So, they probably experience things differently. Because of the differences among animals, we shall suspend judgment as to what objects are "really" like. Why? We cannot judge whether our sense impressions are more accurate than those of other animals. We would need a judge who is not a party to the dispute!
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3rd Mode (pp. 135-136)-
isagreement among the senses. What is pleasing to one sense, can be displeasing to another. What appears to be the case for one sense, does not appear so to another, e.g., to sight a painting may appear to have recesses, but to touch it may appear smooth. So, we cannot say what the thing is really like. Each object appears to have various qualities- e.g., An apple feels smooth, tastes sweet, is yellow in color, etc. Can we say that these sensations capture the essence of the apple? Perhaps there are other possible experiences, produced by means of sensation that we do not have. E.g., a blind person will not experience the apple the same way as a person who sees. So, we suspend judgment as to what the apple is really like.
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The 4th Mode (pp.136-137 )-
differences in circumstances and dispositions. We are in different states at different times, awake/asleep, young/old, well/sick, angry/happy, in love/hate, etc. Things can appear different to people depending upon these circumstances. [Dr. G-Like when food you usually like smells bad while you are sick.) So, we suspend judgment as to what the objects are really like.
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The Problem of the Arbiter
Anyone who tries to settle the dispute is in one of those dispositions, so he cannot be an impartial judge. It doesn’t make sense to claim that the arbiter is in no condition at all. P. 137. [This is true in all the Modes. If HUMAN claims that he/she discerns what is real, he/she will be looking at the world with human sense organs, so the human is not a neutral arbiter.]
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The Problem of Proof and the Criterion (Standard)-p. 138
In order to pass judgment one must use a criterion. If the criterion is false, one will be discredited. So, one must claim that the criterion is true. But, one needs a proof that the criterion is true. So, one needs another criterion upon which to judge that the proof itself is true. But, then one needs another criterion, and so, on ….So, circularity (proof depends on criterion, criterion on proof) and An infinite regress of Criteria …Ad Infinitum . . . Criterion . . . Proof . . . Criterion . . . Proof . . . Criterion (the standard we are using to make the claim)
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The 5th Mode (p. 51)
positions, distances and locations. Aship at a distance looks small, up close large. An oar appears bent in water, straight out of water, etc. On God-P. 186, the dogmatists disagree and the problem of Providence and evil.
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Descartes Meditation VI Proof of the Existence of Corporeal Substance and that Mind and Body are separate and Distinct Remember-
1. God is not a deceiver. (Med. III) (That means the Evil Genius, Demon, is put out of play) 2. The Criterion of Truth with God as guarantor-The Clear and Distinct idea or perception. 3. The essences of corporeal substance and the Cogito (Res Cogitans) from Med. II. 4. The distinction between the three types of ideas. In Med. VI Descartes will discuss the distinction between “Imagination” and “pure intellection.” [intelligere-L. to understand] Near the end, he will make a distinction between dream and reality. That means the “Dream Hypothesis” is finally put out of play. I
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Meditation VI (highlights)
Descartes states that he knows corporeal substance may exist, because he can clearly and distinctly perceive things which have shape, size, etc. (geometry) God is Omnipotent, so God is capable of bringing about everything which Descartes can clearly and distinctly perceive.
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The argument from Imagination.
I can easily imagine a triangle. However, I cannot clearly imagine a chiliagon (a figure of a thousand sides). I can understand a chiliagon (pure intellection). So, pure intellection is more powerful than imagination. Also, Imagination requires a kind of effort which pure intellection does not. So, there is a clear distinction between imagination and pure intellection. I could do without imagination and still remain essentially myself, res cogitans. So, imagination is not an essential part of my nature. It is a secondary quality-is it based upon something outside the mind? Descartes says probably the ideas of imagination come from, or are based upon, a body outside the mind, but only probably. He wants certainty.
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The argument from sense perception.
Descartes experiences other sorts of images like color, taste, sound, pain, pleasure. These ideas are adventitious and sometimes happen against his will. (So, he is not making them up. Someone or something else is. There is no ‘Id’ for Descartes) Furthermore, sense perceptions are more vivid than his factitious ideas. So, there is a clear and distinct difference between adventitious ideas and factitious ideas. Does that mean that he can conclude that “objects” exist and thus cause his “passive” perceptions? Not so fast. Remember that the senses deceive us, e.g., some people claim to feel pain in an amputated limb, a tower in the distance looks round, but up close, square, etc. Also, remember the problem of the dream hypothesis.
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The argument from God’s perfection
Everything which I clearly and distinctly understand can be made by God as I understand them to be (god is omnipotent). So, if I clearly and distinctly understand one thing without the other I can be certain that the things are really different from each other. I have a clear and distinct idea of my existence as a res cogitans. I have a clear and distinct idea of corporeal substance, res extensa, as non-thinking.
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So, it must be true that I am really distinct from my body and can exist without it.
Remember, he proved the existence of the his res cogitans or Cogito in Med. II. He has yet to prove the existence of corporeal substance, although his proof is almost complete.) Descartes can also clearly distinguish between his essential nature, pure intellection, and mere “modes” of thinking like imagination and sense perception. Because sense perceptions are adventitious, something must exist which causes these perceptions. Are there objects in the world? (The cause of the adventitious ideas must be either objects or God, because Descartes does not create them.) God is not a deceiver. So, God doesn’t give me these ideas. So, corporeal objects exist.
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Another Difference between mind and body
Body is made of parts, mind is not (loss of a body part does not result in the loss of a part of the mind)
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Descartes dispenses with the Dream Hypothesis
Now I notice that there is a considerable difference between the two; dreams are never joined by the memory with all the other actions of life, as is the case with those actions that occur when one is awake. Really? What if he were sitting in a chair reading and fell asleep only to dream that he was reading the very same book? Never?
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The Mind/Body Problem | aka, the Interaction Problem
Cartesian" dualism. Descartes and his followers believed that the mind and body are separate, distinct, and independent of each other. However, they also believed that mind and body communicated and interacted with each other. They believed that mind could affect body and vice versa. But the question is, if mind is non-physical, and if body is non-mental, then how could the two possibly affect each other?
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From Campbell’s "Dualisms" Campbell discusses Dualism, the Mind/Body Problem, and some solutions to the problem. First he introduces some propsitions
1. The human body is a material thing. | 2. The human mind is a spiritual thing.
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The human body is a material thing.
He says that by ‘material’ we mean a thing made up of recognized physical stuff like oxygen, carbon, etc. We also mean that the thing’s responses to physical influences satisfy only the laws governing all matter. And, he says, in saying a body is purely material we are committed to holding that only events of a physical kind occur within it. What proof is offered for the proposition that the human body is a material thing? According to Campbell, the sciences of chemistry and biochemistry point to the proposition’s truth.
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The human mind is a spiritual thing.
Well it seems difficult to define. The definition is negative, that is, ‘spiritual’ is defined by negating properties of corporeal substance. Spiritual stuff has no characteristics of corporeal stuff. It is not composed of ordinary material elements, and not subject to ordinary physical laws. But, this doesn’t tell us much. Campbell says that some have argued that there are unique aspects of mind, or spiritual substance, that distinguishes it from corporeal substance.
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Consciousness
it thinks, feels, acts. This could be continuous consciousness, or at least the continuous capacity to be conscious.
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Intentionality
This is a characteristic of mental states. Thoughts have objects of thought. I hope for something. I despair over something. I am angry at someone. But, the ‘somethings’ need not have a material existence. If I run into another vehicle, I have run into something that physically exists now. But, I can worry about something that does not exist. I can hope for a job I do not yet have, etc. I can wonder about unicorns. So, the objects of thought are different than the objects in the physical world. The descriptions of my mental events are different than the descriptions of physical events.u
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what can we conclude about mind and body
From this we conclude that "spiritual" means immaterial and capable of mental life. So, mind would be an immaterial thing capable of mental life.
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Proof that mind is immaterial-
We have knowledge of things which are not physical. Those non-physical things affect our minds, but do not affect the physical world. E.g., numbers. Numbers do not affect matter, but they do affect mind. We know about good and evil, but these things are seen or felt by sense organs. [Again, we are dealing with things that are not physically present to us.] So, the argument goes, mind is open to influences which cannot affect matter. So, mind is not a purely material thing. But we still must ask, if mind and body are separate and distinct, how could they interact?
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Attempted Solutions to the Mind/Body problem: Some Philosophers avoided or attempted to solve the problem by simply denying the existence of one of the two substances.
Materialism and Idealism
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Materialism
The theory that everything is physical, including mind and thought. The Epicureans [Ancient, such as Lucretius, and modern, such as d’Holbach] argued that because body affects mind, and vice versa, both must be physical. Bà B à Bà
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Idealism
The theory that everything is "spiritual," or mental. There is no physical stuff. What we call ‘physical objects’ are simply composites of ideas, e.g., an apple is constituted by the ideas red, sweet, round, crunchy. Berkeley is an example of an idealist. Mà Mà M à
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One Philosopher retained both substances but introduced God as the means of communication between the two substances. Occasionalism
The theory that God is like the messenger boy of the universe. Mind wants to send body a message, but it cannot "speak" to the body. God intercepts the message and relays it to the body, and God relays messages from the body to the mind. Malbranche is an example of an Occasionalist. One problem here is that God would be a deceiver, according to Descartes. Plus, what of phantom pain? How come God doesn’t send everybody’s messages?
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Some Other Attempted Solutions:
Double Aspect Theory,Parallelism,Epiphenomenalism
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Double Aspect Theory
Spinoza-The Theory that mind and bodies are two aspects of some other underlying thing, some ‘X.’ This takes care of the interaction problem, but now we have to figure out what this mysterious underlying substance is.
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Parallelism
Denies interaction, but recognizes two distinct substances, mind and body. Mind appears to affect body and vice versa, but it is illusion. Mind affects mind, body affects body, and the apparent interaction is really the result of the fact that ‘harmony’ between the two was pre-programmed. According to Leibniz, the programmer is God. Mà Mà Mà Bà Bà Bà
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Epiphenomenalism
mind is non-physical but it is a byproduct of the body. Mental events do not affect anything, not even subsequent mental events. Body affects body and affects mind [as a byproduct]. So there is a one way "interaction" between the two.
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Titus Lucretius Carus-De Rerum Natura
In this book Lucretius attempts to explain the world and the universe in terms of atomism. So he is doing metaphysics. He is a materialist, that is, he believes that everything is made up of corporeal substance, or physical "stuff." There is no non-physical "stuff." Everything, including the Gods, is made up of atoms. The atoms are "elemental physical particles."That is, he believes that our knowledge of the world begins with sense perception. On p. 77 Lucretius begins his proof for the existence of the Atomoi. He also has an ethical purpose in writing the book. He said that once we understand that everything comes about by means of physical causes, we will no longer fear the wrath of gods, and we will cease to be driven by superstition. So, we can be happier.
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Lucretius was an
Epicurean
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The Epicureans were Empiricists
that is, they believed that knowledge begins with sense experience and observation of the world.
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Their Criteria for Truth
Perceptions (always true) 2. Preconcepts-memory images lead to a general image of, e.g., ‘man.’ (always true) 3. It is when we form judgments and opinions that error, or falsehood, arises. E.g., judgments about whether images correspond to objects.
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[Epicureans do not doubt the existence of objects—they are the cause of our perceptions] Their theory of perception—eidola,
thin films of atoms shed by objects cause our perceptions. [Lucretius says that the atoms “strike” our sense organs]
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Their Standards of judgment
Error results when we import into judgment anything not confirmed by the evidence or that which is contradicted by the evidence. Truth results from judgments which use evidence which is confirmed by the senses or not contradicted by the senses. (from Epicurus’ “Letter to Herodotus”)
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Lucretius' Arguments for the Existence of the Atoms His first principle is
‘Nothing can be produced from nothing (ex nihilo nihil fit . Or ‘nothing can be created out of nothing’ “Nil posse creari de nilo.”).’ This principle is a conclusion which results from an argument.
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Lucretius uses modus tollens, a rule of logical inference, to reach his conclusion. Modus tollens (aka, Denying the Consequent)
If X then Y 2. Not Y 3. Therefore, not X
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modus tollens
(Premise 1 consists of a conditional statement. The “If” part of the conditional statement is the antecedent. The “Then” part of the statement is the consequent. Premise 2 denies or negates the consequent of premise 1. According to the rule, we may conclude the negation of the antecedent.)
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The second Principle
Nature does not reduce anything to nothing. This principle is also the conclusion of an argument. 1. If any thing were perishable in all its parts, everything might then dissolve right before our eyes. 2. Things do not dissolve before our eyes. They break down because of “blows.” 3. So, it is not the case that things are perishable in all their parts. 1. If over a long period of time all the constituent parts which make up things were completely destroyed, there would not be anything now (he assumes that an infinite amount of time has already passed). 2. Things do exist now and nature renews them (e.g., the rivers and the sea). 3. So, its not the case that things are perishable in all their parts. 4. So, the elemental particles are eternal.
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The third Principle- Nothing except bodily substance can touch or be touched. (Physical events have physical causes and vice versa.)(P. 80)
Lucretius uses this principle to convince us that these elemental particles do exist even though we cannot see them. We cannot see the wind, but we see the physical effects of the wind (e.g., trees bend). So, the wind must be made of tiny particles. We cannot see odors, yet they “strike” our senses. Our sense organs are physical, so the odor must be physical. Garments hung by the sea become moist. (We do not see globs of water pouring over them.) A ring wears down but we don’t see globs of gold falling off. And when people rub the hand of a statue, the hand gradually becomes smaller, etc.
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Fourth Principle
Nature carries on her operations by means of imperceptible particles
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Fifth Principle-
There is vacant space (and void in things) 1. If this were not so, nothing could be moved. 2. Things can be moved. 3. So, there is vacant space in things. Even things which appear to be solid are not solid. E.g, we can hear through walls, water seeps through rocks. So, there is space in things. A ball of wool and a ball of lead of the same size do not weigh the same. The difference will be the vacuity in things (P. 80).
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The Sixth Principle
There is no Boundary to the Universe. (p. 81) The dart argument. How the atoms come together to make up composite objects, PP. 81-83—The atoms are in constant motion. You can detect that sort of motion when you see dust particles dancing in a shaft of sunlight. (The dust particles are not atoms. Atoms are too small to be seen.) The “swerve.” He exhorts us to accept his explanations and end our fear. He states that the universe has imperfections, so it was not created by gods, etc. Therefore, once we understand that everything came about because of physical causes, we will have no fear of the Gods.
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A Posteriori arguments (L. following after):
The Teleological Argument (Gr. Telos, end purpose, goal, final cause)-Also known as the "Design" argument . Our examples are St. Aquinas’ 5th Way and Paley’s argument. 2. The Cosmological argument (Gr. Kosmos, Order vs chaos) Our examples St. Aquinas’ 1st through 4th Ways. A Posteriori arguments make use of empirical evidence and observation of the world.
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A Priori (L. From the first) arguments:
The Ontological Argument (Gr. On, being, Onta, existing things) Our example: St. Anselm’s arguments for the existence of God. A Priori arguments do not make use of empirical evidence. They make use of reason, definitions, etc.
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Aristotle’s Four Causes:
Efficient Cause-the agent or force which brings about the effect. If building a house, the construction workers, etc. Formal Cause-the form, the design plan. For a house, the blueprints. Material Cause-the material out of which something is made. For a house, wood, bricks, etc. The Final Cause-the end toward which, the goal or purpose, the telos. For a house, shelter for humans.k
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Contingent and Necessary Being-
Contingent beings come into being and pass away. They are created and destroyed.
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contingent
Contingent beings are dependant on something else for their existence. They can_not be, that is, they are capable of non-existence. We can conceive of their non-existence. Aquinas calls them "possible" beings.
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Necessary Beings
They are neither created nor destroyed. They are independent beings. They cannot_not exist. We cannot conceive of their non-existence.
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Ex nihilo, nihil fit.
(Latin, "Nothing can be produced from nothing." Assumed to be true by the Ancients as well as by Aquinas.
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Reductio ad Absurdum
(Latin, Reduction to Absurdity. You can prove the negation of a proposition if you can prove that it leads to absurdity. A contradiction is among the things considered absurd.
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A Contradiction- (X and not X)
According Aristotle’s Law of (Non) Contradiction "A thing cannot both be and not be the same thing, at the same time, in the same respect." In other words, a thing cannot be X and not X at the same time. Example, I cannot be both a woman and not a woman, at the same time, in the same respect.
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St. Thomas Aquinas
The Five Ways-from Summa Theologica
79
1st Way-From Motion (change)
We can see that some things in the world are in motion (the change from potential to actual). E. g., Wood is potentially hot, fire is actually hot. 2. Nothing can be both potential and actual at the same time, in the same respect. (E.g., the wood cannot be both potentially hot and actually hot at the same time.) 3. Therefore, it is impossible that a thing can be both mover and moved, in the same respect, at the same time. 4. Therefore, whatever is put in motion must be put in motion by some other actualized thing, and that by some prior actualized thing, and so on, and so on. (E., g., the wood cannot set itself on fire. The wood must be set on fire by some thing which is already hot.), 5. No infinite regress of causes-otherwise there would be no first mover and so, no subsequent movers. 6. Therefore, there must be a Prime Mover, Unmoved Mover, which everyone understands to be God
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2nd Way-From Efficient Cause
We see in the world an order of efficient causes. 2. If a thing were to be its own efficient cause, it would be prior to itself (it would have to exist before it exists) that’s impossible or absurd. 3. So, nothing can be its own efficient cause. 4. The first cause is the cause of the intermediate, and that of the ultimate cause. 5. To take away a cause is to take away its effect. 6. So, if it is possible to go to infinity with efficient causes, there would be no first efficient cause. 7. If there were no first efficient cause, there would be no intermediate efficient causes. 8. There are intermediate efficient causes (we see them in the world). These intermediate causes are effects of prior efficient causes (We just denied the consequent of 7. By two steps of Modus Tollens we get-9 and 10) 9. So, there cannot be an infinite regress of efficient causes. 10. Therefore, there must be a first efficient cause, to which everyone gives the name of God.
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3rd Way-From Possibility and Necessity
n nature we find that things are generated and destroyed (corrupted). 2. So, they are contingent (possible to be and not be) 3. That which is contingent at some point does not exist (is not). 4. So, it is impossible for contingent things to always exist. 5. Therefore, if everything were contingent, at some point there could have been nothing. (nothing could have existed.) 6. That which begins to exist is brought into existence by something which already exists (Ex nihilo nihil fit – Latin, “Nothing can be produced from nothing” and the 1st and 2nd ways.) 7. Therefore, if at one time nothing were in existence, there would not be anything now! 8. That is absurd. (So, If you assume that everything is contingent, you are led to the absurdity that nothing now exists but, of course things do exist). Reductio ad Absurdum. So, it can’t be true that everything is contingent) 9. ( or, we could get there by saying ‘Something does exist now!’ By Modus Tollens denial of the consequent of 7, leads to “So, there was no time in which nothing existed.” ) 10. (“so, there was no time when nothing existed” is a denial of the consequent of 5. So, we could conclude ‘Hence, it is not the case that everything is contingent’ – another Modus Tollens.) 11. Therefore, there must be a necessary being. 12. No infinite regress of necessary beings 13. Therefore, there must be a necessary being having its own necessity, and this all men speak of as God.
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Meditation I/II
Utility of doubt, physical world demon- genius powerful entity
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Meditation II
Asking whether he exists/questions own existence discovery of 1st undoubted truth I think therefore I am he can't doubt he is thinking o
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End of meditation II
Piece of wax argument does not prove that physical stuff exist does prove that primary and secondary stuff exist -allows himself to believe he is a thinking thing as a kind