What I admire in the ancient philosophers is their desire to make their lives conform to their writings, a trait which we notice in Plato, Theophrastus and many others. Practical morality was so truly their philosophy's essence that many, such as Xenocrates, Polemon, and Speusippus, were placed at the head of schools although they had written nothing at all. Socrates was none the less the foremost philosopher of his age, although he had not composed a single book or studied any other science than ethics.

Maximes et Pensées, #448