There is no such thing as a lover's oath. - Plato

[Aristotle] was the most eminent of all the pupils of Plato…. He seceded from Plato while he was still alive; so that they tell a story that [Plato] said, "Aristotle has kicked us off, just as chickens do their mother after they have been hatched."

And what, Socrates, is the food of the soul? Surely, I said, knowledge is the food of the soul.

The soul of him who has education is whole and perfect and escapes the worst disease, but, if a man's education be neglected, he walks lamely through life and returns good for nothing to the world below.