"Envy is the ulcer of the soul."

"Be as you wish to seem."

"Do not trouble about those who practice philosophy, whether they are good or bad; but examine the thing itself well and carefully. And if philosophy appears a bad thing to you, turn every man from it, not only your sons; but if it appears to you such as I think it to be, take courage, pursue it, and practice it, as the saying is, 'both you and your house."

"The great honor in the world is to be what we pretend to be"

"Understanding a question is half an answer."

"I only wish that ordinary people had an unlimited capacity for doing harm; then they might have an unlimited power for doing good."

"All I know is that I know nothing."

"To find yourself, think for yourself."

"Is it true; is it kind, or is it necessary?"

"One should eat to live; not live to eat."