"If we suspect that a man is lying, we should pretend to believe him, for then he becomes bold and assured, lies more energetically, and is unmasked."

"The only way to be happy is to be unhappy."

"The only truly happy beings are those who have never been born."

"The pleasure in life is in the last analysis merely negative. It is the cessation of pain."

"The general mistake is to suppose that we shall do something great in the future."