--- date: '2023-12-07' description: comprehensive philosophy notes covering socrates, plato's republic and cave allegory, aristotle's causation, epicurus, stoicism, descartes, and spinoza. id: Nous modified: 2026-06-05 15:08:42 GMT-04:00 tags: - philos1aa3 title: Nous created: '2023-12-07' published: '2023-12-07' pageLayout: default slug: thoughts/university/twenty-three-twenty-four/philo-1aa3/Nous permalink: https://aarnphm.xyz/thoughts/university/twenty-three-twenty-four/philo-1aa3/Nous.md generator: quartz: v4.6.0 hostedProvider: Cloudflare baseUrl: aarnphm.xyz full: https://aarnphm.xyz/llms-full.txt --- Notes: [[thoughts/university/twenty-three-twenty-four/philo-1aa3/All.pdf|notes]] Reference: [[thoughts/university/twenty-three-twenty-four/philo-1aa3/1A3Reader(2019).pdf|text]] This survey follows the course’s questions about knowledge, the soul, and living well. Socrates appears here through Plato’s dialogues; a claim made by that character needs to be distinguished from a claim about the historical Socrates. The lecture slides also contain compressed interpretations. The source fragments below retain their wording, with qualifications where that wording leaves out a premise or overstates a conclusion. ### [[thoughts/Socrates|Socrates]]’s Idea of Good The course describes the good in terms of human flourishing. Socrates asks what makes a life good and whether wealth, reputation, or political power can supply it without wisdom. In the _Apology_ (29d–30b), care for the soul takes priority over acquiring wealth. This is an ethical claim about how to live. The lecture’s separate list of the faults of democracy describes an ancient criticism: assemblies can follow flattery, confuse freedom with license, and neglect expertise. It should not be read as an established diagnosis of every democracy, or as a complete account of Socrates’s politics. Plato develops a case for philosophical rule in the _Republic_; the argument needs its own premises about knowledge and political authority. _See [[thoughts/Plato#Apology|Apology]] for more information._ ### soul and knowledge in the Phaedo In [[thoughts/university/twenty-three-twenty-four/philo-1aa3/tut/Phaedo and Apology|Phaedo]], Socrates faces execution and argues that the soul can survive the body’s death. The lecture excerpt summarizes his distrust of bodily distraction: `The body confuses the soul and does not allow it to acquire truth and wisdom` The argument concerns whether reason can grasp things such as Equality itself while the senses present changing, imperfect instances. Its conclusion about a separable soul depends on further arguments.[^phaedo] 1. **Opposites, 70c–72e.** Waking comes from sleeping and sleeping from waking. Socrates proposes a similar cycle between life and death: if the living come from the dead, souls must exist between lives. The disputed premise is whether life and death form a reversible process in this sense. 2. **Recollection, 72e–77a.** We judge sensible things to fall short of perfect Equality. Socrates argues that this judgment presupposes knowledge acquired before birth. Even if granted, pre-existence alone leaves survival after death unproved. At 77c–d he joins recollection to the earlier cyclical argument to address that gap. 3. **Affinity, 78b–80b.** Bodies resemble visible, changing things; souls resemble intelligible, stable Forms. This resemblance supports an expectation that the soul resists dissolution. Understanding something unchanging does not by itself establish that the thing doing the understanding is indivisible. Simmias’s harmony objection and Cebes’s weaver objection (85e–88b) challenge the inference to survival: a soul might depend on a body or outlast several bodies and still perish. 4. **The final argument, 102a–107a.** Three always brings oddness and cannot become even while remaining three. Socrates likewise treats the soul as what brings life, so it cannot admit death. He then argues that the deathless is also imperishable. That additional step matters: exclusion of an opposite alone leaves open whether something withdraws or is destroyed when its opposite approaches. These are arguments within Plato’s account of soul and Forms. Calling the soul simple, or defining it as life-giving, does not establish the whole conclusion without those premises. ### knowledge and the cave _See [[thoughts/Plato#Republic|Republic]]._ A true opinion gets an answer right; knowledge includes an account of why it is right. In the _Republic_, this distinction belongs to the larger contrast between changing sensible things and intelligible Forms. Dialectic examines the assumptions on which an explanation depends. The course map collects these distinctions: ![[thoughts/university/twenty-three-twenty-four/philo-1aa3/knowledge-map-thoughts.webp]] In the cave (_Republic_ VII, 514a–521b), prisoners take shadows for the things casting them. Education turns a person’s attention toward what explains those appearances. The ascent is difficult, and the returning prisoner can meet disbelief. Plato’s political proposal is that people trained to understand the good should return to govern. Understanding and legitimate authority remain distinct questions: a claim to expertise needs justification before it can support rule over others. The lecture closes with this interpretation (_All.pdf_, PDF page 73): > And we can understand that, the idea of the good. At least some of us can. They are the philosophers, masters of the dialectic, and they should govern the rest. ### [[thoughts/Aristotle|Aristotle]]: truth and causes
The lecture gives Aristotle’s definition of truth: > “To say of what is that it is, and of what is not that it is not, is true.” Its shorthand for a correspondence account is: > Truth is the correspondence of substance and statement The first formulation concerns whether a statement says things are as they are. It supplies a definition of truth; it does not supply a procedure that settles every disputed statement (_Metaphysics_ IV.7, [`1011b25`](https://github.com/aarnphm/aarnphm.github.io/commit/1011b25)–27). Aristotle’s four causes answer different questions about a thing or a change (_Physics_ II.3). For a bronze statue: | cause | explanatory question | statue example | | --------- | -------------------------------------- | --------------------------------------------------- | | material | What is it made from? | The bronze that takes a new form. | | formal | What makes it the kind of thing it is? | The statue’s form or defining structure. | | efficient | What produces the change? | The sculptor exercising the craft of statue-making. | | final | For the sake of what is it made? | The end served, such as commemorating someone. | The lecture calls formal cause the “law of the change.” Form specifies what the thing is, so that phrase needs the fuller account above. In natural things, a final cause can be a function or end without being a person’s conscious intention.[^causes] ### [[thoughts/university/twenty-three-twenty-four/philo-1aa3/Epicurus#Desire|Epicurus]]: gods, death, and fear Epicurus accepts gods as blessed and immortal beings. His account excludes the anger, favoritism, and burdens of managing human affairs that people attribute to them. The lecture’s abbreviated wording is: > Happiness is uninterrupted tranquility. If intervene, from some disturbance of tranquility > existence of evils proves indifference to gods. This compresses an argument, rather than giving an independent proof from the existence of evil. Evil alone does not establish divine indifference; that inference also needs assumptions about the gods’ knowledge, power, and possible reasons to intervene. Epicurus’s treatment begins from what blessedness allows us to attribute to a god (_Letter to Menoeceus_, 123–124). Epicurean atomism treats the soul as bodily and destructible. Its dispersal ends sensation. The argument about death then depends on the premise that good and evil for us require sensation: once we are dead, there is no subject experiencing death as a harm. Whether losing possible future goods can itself be bad remains a separate objection (_Letter to Menoeceus_, 124–125; _Letter to Herodotus_, 63–67).[^epicurus] ### [[thoughts/university/twenty-three-twenty-four/philo-1aa3/tut/Stoic|Stoicism]]: fate and agency Stoicism inherits the Cynics’ concern with training and living according to nature, then develops its own physics, logic, and ethics. The Stoics describe the cosmos as continuous matter structured by an active rational principle. Their rejection of void **inside the cosmos** allows an incorporeal void outside it. “No empty space” is too broad.[^stoics] ![[thoughts/university/twenty-three-twenty-four/philo-1aa3/epistemology.webp]] The lecture attributes this passage to Epictetus: > Epictetus: “If a good man could foresee the future, he would cooperate with sickness, death, and mutilation; for he would be aware that this had been ordained by the universal order of things, and that the whole is more important than the parts.” This is a claim about the sage’s acceptance of a rational cosmic order. It does not tell someone who cannot foresee the future to abandon treatment. The course’s response to the “lazy argument” is that consulting a physician belongs to the course of events through which recovery can occur (_All.pdf_, PDF pages 143–148). Determinism includes deliberation and assent among the causes of action. An impression may arise involuntarily; assent is the rational agent’s acceptance of it as true. Stoic responsibility rests on the agent’s contribution through judgment, even though that contribution has a causal history. In Epictetus’s ethics, virtue determines whether a life goes well. Illness, poverty, and reputation are external to that standard; their occurrence is plainly outside our complete control. The claim that evaluative judgments produce distress should also be distinguished from a claim that every bodily pain or involuntary reaction is a voluntary mistake. The opening of the _Enchiridion_ limits what is up to us, and the distinction is lost if “every act is chosen” includes everything that happens to a person.[^epictetus] ### [[thoughts/Descartes|Descartes]]: doubt, thought, and extension Sensory illusions motivate doubt about perception. Descartes extends the exercise through dreaming and the possibility of systematic deception. The lecture notes abbreviate two points as: > The idea of god is a perfect being > I think, therefore, I exists The latter records the _cogito_: doubting is itself thinking, so the thinker exists while thinking. The _Second Meditation_ establishes this immediate certainty even under the supposition of deception. Establishing an enduring mind, a body, or an external world requires further argument. Descartes later uses clear and distinct perception as a rule of truth, whose general reliability he argues for through God; the cogito alone does not settle every application of that rule.[^descartes] Descartes identifies the essence of body with spatial extension. The course draws out these consequences: 1. Size, shape, position, and motion characterize extended bodies. Color and taste involve perception, as the diagram shows. ![[thoughts/university/twenty-three-twenty-four/philo-1aa3/descartes-qualities.webp]] 2. A vacuum becomes impossible within this theory. The lecture’s explanation is: > space is identical with matter, then the idea of “empty space” becomes impossible. The physical universe is therefore “filled up,” a plenum, with no empty space. 3. Extension alone does not explain how a body acquires motion. The course describes bodies as inert and motion as transmitted between them. 4. If mind thinks without extension and body is extended, their interaction needs explanation. Naming two kinds of substance leaves that causal problem open. ### [[thoughts/Sphinoza|Spinoza]]: substance and modes _Deus sive Natura_, God or Nature. For Spinoza, substance exists in itself and is conceived through itself. A mode is a way substance is modified, and depends on it. His _Ethics_ I, propositions 7 and 14–15, argues that substance necessarily exists and that God is the only substance. Human beings are finite modes within Nature. “Self-caused” means that a substance’s essence involves existence; it does not mean a thing makes itself at an earlier time.[^spinoza] The lecture contrasts this with Descartes’s account of a person as a union of mind and body. It argues that a finite, dependent human cannot be a necessary, self-caused substance. This conclusion uses Spinoza’s account of substance. Descartes allows created substances to depend on God, so the two thinkers’ criteria must be compared before the conclusion can function as an objection to dualism. Thought and extension are attributes of the same substance. A human mind and its body express the same individual under those attributes (_Ethics_ II, propositions 7 and 13). Their correspondence is not a causal signal crossing from an immaterial substance to a material one. ![[thoughts/university/twenty-three-twenty-four/philo-1aa3/spinoza-knowledge.webp]] [^phaedo]: _All.pdf_, PDF pages 35–41; course reader, _Phaedo_, printed pages 49–76 (PDF pages 51–78). The abridged reader omits the later objections and final argument. The later objections and final argument are in the [complete dialogue](https://classics.mit.edu/Plato/phaedo.html), at the Stephanus passages given above. [^causes]: _All.pdf_, PDF pages 93–94 and 100. See [Aristotle on Causality, §2](https://plato.stanford.edu/entries/aristotle-causality/#FouCau) for _Physics_ II.3 and the bronze-statue example. [^epicurus]: Course reader, printed pages 143–150 (PDF pages 145–152); [Letter to Menoeceus](https://classics.mit.edu/Epicurus/menoec.html). The soul’s bodily nature is summarized in _All.pdf_, PDF page 116; _Letter to Herodotus_ 63–67 gives the underlying account. [^stoics]: [Stoicism, §§2.1–2.2, 2.8–2.9](https://plato.stanford.edu/entries/stoicism/) explains void, causation, and assent. Compare the lecture shorthand at _All.pdf_, PDF pages 138 and 143–148. [^epictetus]: Course reader, _Enchiridion_, printed pages 152–165 (PDF pages 154–167), especially chapters 1 and 5; [complete text](https://classics.mit.edu/Epictetus/epicench.html). The lecture’s broader moral claims appear at _All.pdf_, PDF page 151. [^descartes]: Course reader, _Meditations_ I–II, printed pages 166–174 (PDF pages 168–176); _All.pdf_, PDF pages 169–175. See [Descartes’ Epistemology, §§4–5](https://plato.stanford.edu/entries/descartes-epistemology/) for the cogito and the clear-and-distinct rule. [^spinoza]: Course reader, _Ethics_ I, definitions 1, 3 and 5 and propositions 7, 14–15 (PDF pages 177–183); II, propositions 7 and 13. See [Baruch Spinoza, §§2.1–2.2](https://plato.stanford.edu/entries/spinoza/) for the substance/mode distinction and mind–body identity.