No More Learning

There is actually a Parian philosopher residing
in Athens, of whom I have heard; and I came to hear of him in this
way: - I met a man who has spent a world of money on the Sophists,
Callias the son of Hipponicus, and knowing that he had sons, I asked
him: "Callias," I said, "if your two sons were foals or calves, there
would be no difficulty in finding someone to put over them; we should
hire a trainer of horses or a farmer probably who would improve and
perfect them in their own proper virtue and excellence; but as they
are human beings, whom are you           of placing over them?