Diogenes, when asked from what country he came, replied, "I am a citizen of the world."

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.

Bias used to say that men ought to calculate life both as if they were fated to live a long and a short time, and that they ought to love one another as if at a future time they would come to hate one another; for that most men were bad.

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

But Chrysippus, Posidonius, Zeno, and Boëthus say, that all things are produced by fate. And fate is a connected cause of existing things, or the reason according to which the world is regulated.

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

Courage, my boy! that is the complexion of virtue.