Diogenes

On one of his journeys Diogenes was captured by pirates, who sold him as a slave to Xeniades of Corinth.  When his owner asked him what he could do, he answered, “Govern men.”

He said that there was one only good, namely, knowledge; and one only evil, namely, ignorance.

All things are in common among friends.

Aristotle was once asked what those who tell lies gain by it. Said he, "That when they speak truth they are not believed."

As a matter of self-preservation, a man needs good friends or ardent enemies, for the former instruct him and the latter take him to task.

Bury me on my face, said Diogenes; and when he was asked why, he replied, Because in a little while everything will be turned upside down.

The mob is the mother of tyrants.

The sun too penetrates into privies, but is not polluted by them.

Chilo advised, "not to speak evil of the dead."

Nothing can be produced out of nothing.