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

As some say, Solon was the author of the apophthegm, "Nothing in excess.

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.

Anaximander used to assert that the primary cause of all things was the Infinite,-not defining exactly whether he meant air or water or anything else.

Pythagoras used to say that he had received as a gift from Mercury the perpetual transmigration of his soul, so that it was constantly transmigrating and passing into all sorts of plants or animals.

Diogenes lighted a candle in the daytime, and went round saying, "I am looking for a man.

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