"No period of history has ever been great or ever can be that does not act on some sort of high, idealistic motives, and idealism in our time has been shoved aside, and we are paying the penalty for it."

"There are no whole truths; all truths are half-truths. It is trying to treat them as whole truths that plays the devil."

"In formal logic, a contradiction is the signal of defeat, but in the evolution of real knowledge it marks the first step in progress toward a victory."

"An enormous part of our mature experience cannot not be expressed in words."

"Marriage is this grand madness, and I think if people knew that, they would perhaps take it more seriously."

"I don't think you can tell the objective truth about a person. That's why people write novels."

"There are two things in the painter, the eye and the mind; each of them should aid the other."

"I think a loaded weapon aboard an airplane, whether it's in the cargo section or in your overhead baggage, is a security issue."