Diogenes

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

Wise kings generally have wise counselors; and he must be a wise man himself who is capable of distinguishing one.

It takes a wise man to discover a wise man.

Wise leaders generally have wise counselors because it takes a wise person themselves to distinguish them.

I do not know whether there are gods, but there ought to be.

Most men are within a finger's breadth of being mad.

The art of being a slave is to rule one's master.

The great thieves lead away the little thief.

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.

When I look upon seamen, men of science and philosophers, man is the wisest of all beings; when I look upon priests and prophets nothing is as contemptible as man.

The sun, too, shines into cesspools and is not polluted.

Blushing is the color of virtue.

Those who have virtue always in their mouths, and neglect it in practice, are like a harp, which emits a sound pleasing to others, while itself is insensible of the music.

A friend is one soul abiding in two bodies.

The mob is the mother of tyrants.

Dogs and philosophers do the greatest good and get the fewest rewards.

It was a favorite expression of Theophrastus that time was the most valuable thing that a man could spend.

Calumny is only the noise of madmen.

What I like to drink most is wine that belongs to others.

No man is hurt but by himself.