"In all things it is a good idea to hang a question mark now and then on the things we have taken for granted."

"Men who are unhappy, like men who sleep badly, are always proud of the fact."

"A stupid man's report of what a clever man says can never be accurate, because he unconsciously translates what he hears into something he can understand."

"We know very little, and yet it is astonishing that we know so much, and still more astonishing that so little knowledge can give us so much power."

"Many people would sooner die than think; In fact, they do so."

"The place of the father in the modern suburban family is a very small one, particularly if he plays golf."

"I disapprove of what you say, but will defend to the death your right to say it."

"Hell is other people."

"There are no facts, only interpretations."

"If a pessimist is always right, is he a realist?"

"That's one small step for [a] man, one giant leap for mankind."

"An intellectual says a simple thing in a hard way. An artist says a hard thing in a simple way."