When asked what learning was the most necessary, he said, “Not to unlearn what you have learned!”

One of the sayings of Diogenes was that most men were within a finger's breadth of being mad; for if a man walked with his middle finger pointing out, folks would think him mad, but not so if it were his forefinger.

One of the sophisms of Chrysippus was, "If you have not lost a thing, you have it.

Plato was continually saying to Xenocrates, "Sacrifice to the Graces.

Xenophanes speaks thus:-And no man knows distinctly anything,And no man ever will.

Sacrifice to the Graces.

There is a written and an unwritten law. The one by which we regulate our constitutions in our cities is the written law; that which arises from customs is the unwritten law.