This page contains B grade level summary revision notes for the Plato & Aristotle topic.
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AO1: Plato’s rationalism: theory of forms & Allegory of cave
- Rationalism is the view that knowledge is gained a priori, not from experience.
- Plato’s allegory of the cave illustrates this and his theory of forms.
- Prisoners are trapped in a cave and take shadows on a wall to be the real world.
- One prisoner escapes and sees the true world outside.
- Plato thinks our senses are like the shadows: they show appearances, not reality.
- The true world is the world of forms.
- Forms are perfect, eternal and unchanging.
- The things we experience are imperfect copies that “partake in” the forms.
- For example, a beautiful sunset is only a changing instance of beauty, not beauty itself.
- So, Plato accepts that experience is unreliable and says reason is needed for knowledge.
AO2: Plato’s rationalism
- Plato’s cave suggests empiricism leads to scepticism.
- We can never be sure that our experiences reveal true reality rather than illusions.
- This is like Descartes’ evil demon or a modern simulation argument.
- Any evidence we use to prove we are not deceived could itself be part of the deception.
- So, empiricism cannot guarantee knowledge of reality.
Counter
- Aristotle offers a more practical critique than “there is no evidence for forms.”
- Plato expects no empirical evidence, since he treats experience as shadows.
- Aristotle argues we can gain knowledge through experience by studying causes and change.
- We can explain the world without positing a separate realm of forms.
- So the theory of forms becomes an unnecessary hypothesis.
Evaluation
- Aristotle’s approach is stronger because it developed into modern science.
- Modern science does not only passively observe “shadows.”
- It tests ideas through experiments, prediction and control.
- This active interaction with experience makes knowledge possible despite error.
- Scientific success suggests experience has real value when used carefully.
- So Plato is wrong to dismiss evidence entirely.
- Rationalism alone is not safer, because reason can also be mistaken.
- Overall, Plato’s sceptical critique is powerful, but Aristotle gives the better method.
AO1: The hierarchy of forms & form of the good
- Plato’s theory of forms includes a hierarchy, showing degrees of reality.
- He does not think things are simply real or not real.
- Instead, some things are more real than others.
- The highest form is the Form of the Good.
- In the cave analogy it is symbolised by the sun.
- Just as the sun makes sight possible, the Good makes knowledge possible.
- It also explains the existence of other forms.
- Below it are higher forms like justice and beauty.
- Below those are mathematical forms.
- Below those are the forms of ordinary things, like the form of “tableness.”
- Plato thinks knowledge of the Good makes someone morally perfect and fit to rule.
AO2: Evaluation of Plato’s hierarchy & form of the good
- Aristotle argues virtue requires more than knowing what goodness is.
- Good character involves habits, training and controlling desires.
- So Plato seems too optimistic in thinking knowledge of the Good makes wrongdoing impossible.
- Nietzsche also attacks the Form of the Good as a “dangerous error.”
- He thinks philosophers invent such ideas to justify their own desire to rule.
Counter
- Plato could reply that knowledge and virtue are closely connected.
- In the Republic, justice is harmony, where reason rules appetite and spirit.
- So understanding the Good is not just theory, but shapes the soul’s order.
- Plato might also say an objective Good protects morality from bias and power.
- If goodness were just convention, rulers could justify injustice more easily.
Evaluation
- However, Plato’s defence is unconvincing.
- We do not see morally perfect people in history, which suggests Plato’s ideal is unrealistic.
- Hume also argues reason is often driven by desires, and Freud adds that much is unconscious.
- So Plato overestimates reason’s ability to escape human motivation.
- If reason can be corrupted, Plato loses his basis for thinking rationalism is superior to evidence.
- Nietzsche’s suspicion also seems credible when Plato uses the Good to justify philosopher rule.
- So the hierarchy is interesting, but Plato’s moral conclusions look exaggerated and ideological.
AO1: Aristotle’s four causes
- Aristotle’s empiricism argues we can gain knowledge from experience.
- He rejects Plato’s separate forms and instead sees form as part of objects.
- This is immanent realism and fits his hylomorphism of matter and form.
- To know something is to understand why it exists and how it changes.
- Aristotle answers Heraclitus by explaining change through causes.
- He identifies four causes.
- Material cause is what something is made of, like wood in a chair.
- Formal cause is its defining structure or essence, like the shape of a chair.
- Efficient cause is what produces it, like a carpenter.
- Final cause is its purpose or telos, like being sat on.
- This is an early scientific method of explaining patterns in the world.
AO2: The modern scientific critique of telos
- Modern science often rejects Aristotle’s idea of telos as unscientific.
- Bacon argued final causes distract from real explanation.
- Science describes the universe in terms of matter and forces, not built-in purposes.
- So purpose looks like a human projection onto reality rather than something real.
- This makes Aristotle’s final cause seem outdated.
Counter
- Polkinghorne argues purpose is still important.
- Science can often explain the “what” but not the “why.”
- Humans naturally ask why the universe exists and why it is intelligible.
- So telos might point beyond the limits of empiricism, rather than being eliminated by it.
- This suggests purpose cannot be dismissed so quickly.
Evaluation
- However, this does not really defend Aristotle’s use of telos.
- Aristotle wanted telos to be part of empirical explanation of nature.
- But modern biology explains acorns becoming oak trees through DNA and environment.
- The changes Aristotle explained by final cause can be explained by material and efficient causes.
- So telos is not needed for explanation.
- Ockham’s razor supports dropping unnecessary concepts.
- Even if telos cannot be disproved, we have no strong reason to believe it exists.
- So Aristotle’s method survives, but his teleology does not.
AO1: Aristotle’s prime mover
- Aristotle argued that change needs an ultimate explanation.
- He thought the universe was eternal, but motion within it still needed a cause.
- He observed that a rolled ball stops, so motion seems to require sustaining.
- Yet the stars and planets keep moving.
- So he concluded there must be a prime mover sustaining cosmic motion.
- This prime mover cannot itself be moved, so it has no potentiality.
- It is pure actuality and cannot be material, since matter changes and decays.
- It is an eternal immaterial mind.
- It does not push the universe as an efficient cause.
- Instead it causes motion as a final cause, by attracting things towards perfection.
- So it explains motion as the pull towards full actuality.
AO2: Evaluation of the prime mover
- Modern science rejects Aristotle’s idea that motion needs constant sustaining.
- Newton’s inertia says motion continues unless acted on by another force.
- A ball stops because of friction, not because motion “runs out.”
- So the stars keep moving because there is little resistance in space.
- Kenny says Newton’s law “wrecks” Aristotle’s argument.
- So we do not need a prime mover to explain ongoing motion.
Counter
- Aquinas develops Aristotle into an argument for an uncaused cause.
- He treats God as the efficient cause, not just the final cause.
- Even if causes go back infinitely, Aquinas says the series still needs an explanation.
- We can still ask why the whole chain exists at all.
- So Aquinas tries to avoid Newton’s critique by shifting the argument.
Evaluation
- Hume argues even this upgraded argument fails.
- It risks the reification fallacy by treating a series as a “thing” needing its own cause.
- A series is not something over and above its parts.
- If each part is explained, then the series is explained.
- So asking for a cause of the totality is unnecessary.
- This weakens both Aquinas and Aristotle’s claim that an infinite chain needs a further explanation.
- Still, Aristotle’s deeper legacy is his method.
- Modern science developed his empirical approach, even while rejecting his physics.
- So Aristotle’s method was right, even if many details were wrong.