Plato vs Aristotle: what is the difference?

Who were Plato and Aristotle?

Plato was born in Athens around 428 BC into an aristocratic family. As a young man he followed Socrates, and the trial and execution of Socrates in 399 BC shaped the rest of his life. Around 387 BC he founded the Academy in a grove outside the city walls. He wrote about 35 dialogues that survive complete, among them the Republic, the Symposium, the Phaedo and the Timaeus. He died in Athens in 348 or 347 BC.

Aristotle was born in 384 BC at Stagira in northern Greece, the son of a doctor at the Macedonian court. He came to the Academy at about 17 and stayed roughly twenty years, until Plato died. He then worked at Assos and on Lesbos, where he studied marine animals, and from 343 BC tutored the young Alexander the Great. In 335 BC he returned to Athens and opened his own school, the Lyceum. He died at Chalcis in 322 BC.

One fact explains a lot about how they read today. Plato's polished dialogues survive. Aristotle also wrote dialogues for the public, and the Roman orator Cicero admired their style, but they are lost. What we have from Aristotle are mostly his teaching notes, which is why he can read as dense and dry.

Plato vs Aristotle: the comparison table

The big disagreement: are the Forms real?

For Plato, every beautiful thing you see is beautiful because it shares in Beauty itself, a Form that never changes and never dies. The things around us are like shadows on a cave wall; the Forms are the real objects. The allegory of the cave in Republic Book VII is his most famous picture of this.

Aristotle studied this theory for two decades and then rejected its central claim. In Metaphysics Books I and XIII he argues that Forms existing on their own explain nothing: they do not cause change, and they double the number of things to be explained. For Aristotle, the form of a horse is real, but it exists in actual horses. A thing is matter organised by a form, and to understand it you ask four questions, its four causes: what it is made of, what shape or structure it has, what made it, and what it is for.

He knew he was criticising his teacher. In Nicomachean Ethics I.6 he says that friends and truth are both dear, but piety requires us to honour truth first. The Latin saying “Plato is my friend, but truth is a greater friend” is a later summary, not his words.

This disagreement is the subject of the Yuga debate Are the Forms more real than the things we see?, set in the grove of the Academy around 350 BC.

Where they agreed

It is easy to make them opposites. They shared more than the textbooks suggest.

• Both thought knowledge must be of what is general and stable, not of passing impressions. Aristotle kept the word form (eidos) from Plato.
• Both thought the purpose of politics is to make citizens good, not only safe or rich.
• Both distrusted democracy run by crowds swayed by speakers, and both accepted slavery, which Aristotle defended as natural in Politics Book I.
• Both thought virtue needs training and habit from childhood, and both wrote about education in detail (Republic; Politics Books VII and VIII).
• Both believed the universe is ordered and can be understood by reason.

Where they differed on politics, art and ethics

Politics. Plato's Republic designs an ideal city from first principles, ruled by philosophers who own no private property and, among the guardian class, share families. Aristotle attacks exactly these proposals in Politics Book II, arguing that people care less for what is held in common. His school collected the constitutions of 158 Greek states; one, the Constitution of the Athenians, was rediscovered on papyrus in the 1890s. His preferred practical regime, which he calls polity, mixes features of democracy and oligarchy and rests on a large middle class.

Art. In Republic Book X Plato says imitative poetry is a copy of a copy, two steps from the truth, and that it feeds emotion over reason. Aristotle's Poetics answers that imitation is natural and how we learn, and that tragedy, through pity and fear, brings about catharsis of those emotions.

Ethics. Plato connects the good life to knowledge of the Good, the highest Form. Aristotle calls that idea useless for practical life and defines happiness (eudaimonia) as virtuous activity over a complete life, with friends and some external goods. Each virtue is a mean between two vices: courage lies between cowardice and rashness.

Women. Plato's Republic Book V says women of the right nature should receive the same education as men and can rule as guardians. Aristotle, in Politics Book I, says men are naturally fitter to rule. Both views come with assumptions modern readers will question, and you should quote them accurately rather than tidy them up.

There is a famous visual summary. In Raphael's fresco The School of Athens (1509 to 1511) in the Vatican, Plato points upward and Aristotle holds his hand out flat, toward the world. Read more about the painter at Raphael.

Did Aristotle learn from Plato or break with him?

Both. He spent about twenty years at the Academy, from roughly 367 to 347 BC, first as a student and later as a teacher and researcher. Many of his ideas start as Platonic problems. Plato's own late dialogue Parmenides raises objections to the Forms, including one that Aristotle later developed as the “third man” argument.

When Plato died, the Academy went to his nephew Speusippus, not Aristotle. Aristotle left Athens soon after. Ancient writers such as Diogenes Laertius (Lives, Book 5) tell stories of friction between them, but those were written centuries later and should be treated as anecdote.

Questions to ask each of them

Good questions push each thinker on the weak point of his own system. For an interview project or a classroom debate, try these.

1. Plato: if the Forms are perfect and unchanging, how can anything in our world take part in them?
2. Plato: why should philosophers want to rule, if they would rather study?
3. Plato: is the story of Atlantis in the Timaeus and Critias history or a teaching myth?
4. Plato: why use a story like the cave when you distrust poets?
5. Aristotle: you say happiness needs some luck and wealth. Is a poor or enslaved person shut out of the good life?
6. Aristotle: how did you decide what was “natural” in politics, and could you be wrong?
7. Aristotle: you dissected and watched animals on Lesbos. What did observation teach you that argument could not?
8. Both: what did you each learn from Socrates, and where did you leave him behind?

You can hear each answer in his own manner on Yuga, by voice or text, with Plato or Aristotle. The recreations are built from their writings and the historical record, but they are AI and can be wrong. For an essay, cite the dialogues and treatises themselves, by book and section number, not the app. See also questions to ask Plato and questions to ask Aristotle.

Which one should you use for your project?

Choose Plato for a project on justice, the ideal society, the allegory of the cave, love (the Symposium) or the death of Socrates. His dialogues are readable at 15, especially the Apology and Book VII of the Republic.

Choose Aristotle for ethics in everyday life (the golden mean), the beginnings of biology and logic, how a tragedy works, or the education of Alexander. Read Nicomachean Ethics Books I and II first.

Choose both for any question about where knowledge comes from: reason or experience. It is the oldest version of a debate that runs through the ancient Greek thinkers to the scientific revolution.