"There is no good or evil, there is only pleasure and pain."

"I don't know what the heart is, not I: I only use the word to denote the mind's frailties."

"Cruelty, far from being a vice, is the first sentiment implanted in us by nature."

"The more I know men, the more I admire dogs."

"I preach nothing but pleasure, and I practice what I preach."