Plato's philosophy is summed up in the life of reason.
Reason is a way of knowledge, it is also a way on conduct.
Man does not know, but, in his pride, believes that he knows. The first step in learning is the destruction of human conceit. In our days, philosophy has become a technical subject, the exercise of intellectual curiosity for its own sake. But for Plato, philosophy meant also a way of life. And by virtue of its intimate personal character, it is incommunicable by books, or even by speech.