Nuggets

The most famous of Socrates's pupils was an aristocratic young man named Plato. After the death of Socrates, Plato carried on much of his former teacher's work and eventually founded his own school, the Academy, in 385. The Academy would become in its time the most famous school in the classical world, and its most famous pupil was Aristotle.

We know much about Plato's teachings, because he wrote dialogues between Socrates and others that would explore philosophical issues. These dialogues would be used in his school as starting points for discussion; these discussions and Plato's final word on the dialogues have all been lost to us. The Platonic dialogues consist of Socrates asking questions of another and proving, through these questions, that the other person has the wrong idea on the subject. Initially, Plato seems to have carried on the philosophy of Socrates, concentrating on the dialectical examination of basic ethical issues: what is friendship? what is virtue? can virtue be taught? In these early Platonic dialogues, Socrates questions another person and proves, through these questions, that the other person has the wrong idea on the subject. These dialogues never answer the questions they begin with.

However, Plato later began to develop his own philosophy and the Socrates of the later dialogues does more teaching than he does questioning. The fundamental aspect of Plato's thought is the theory of "ideas" or "forms." Plato, like so many other Greek philosphers, was stymied by the question of change in the physical world. Heraclitus had said that there is nothing certain or stable except the fact that things change, and Parmenides and the Eleatic philosophers claimed that all change, motion, and time was an illusion. Where was the truth? How can these two opposite positions be reconciled? Plato ingeniously combined the two; a discussion of Plato's theory of forms is below.

The most famous of Plato's dialogues is an immense dialogue called The Republic , and, next to his account of Socrates's trial, The Apology , The Republic is one of the single most influential works in Western philosophy. Essentially, it deals with the central problem of how to live a good life; this inquiry is shaped into the parallel questions (a) what is justice in the State, or what would an ideal State be like, and (b) what is a just individual? Naturally these questions also encompass many others, such as how the citizens of a state should be educated, what kinds of arts should be encouraged, what form its government should take, who should do the governing and for what rewards, what is the nature of the soul, and finally what (if any) divine sanctions and afterlife should be thought to exist. The dialogue, then, covers just about every aspect of Plato's thought. There are several central aspects to the dialogue that sum up Platonic thought extremely well: a.) what the nature of justice is; b.) the nature of an ideal republic; and c.) the allegory of the cave and the divided line, both of which explain Plato's theory of forms.

The Nature of Justice. The question which opens this immense dialogue is: what is justice? Several inadequate definitions are put forward, but the most emphatically presented definition is given by a young Sophist, Thrasymachus. He defines justice as whatever the strongest decide it is, and that the strong decide that whatever is in their best interest is just (review again the Athenian position in Melian Debate). Socrates dismisses this argument by proving that the strong rarely figure out what is in their best interest, and this can't be just since justice is a good thing.

The Analogy of the Ideal Republic. After Thrasymachus leaves in a royal huff, Socrates starts the question all over again. If one could decide what a just state is like, one could use that as an analogy for a just person. Plato then embarks on a long exposition about how a state might embody the four great virtues: courage, wisdom, temperance, and justice. The remainder of the dialogue is a long exposition of what justice