"The value of a man is not measured by the number of truths he has accumulated, but by the extent to which he has freed himself from error."

"Man is the only animal that causes pain to others for the mere pleasure of doing it."

"No rose without a thorn. But many a thorn without a rose."

"Just remember, once you're over the hill you begin to pick up speed."

"Monotheism is a great evil. It has caused more wars and bloodshed than any other religion."