Diogenes

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

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

"The foundation of every state is the education of its youth."

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

"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."

"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."