"Racism, pollution and the rest of it are themselves very close to extinction."

"Sometimes I think we're alone. Sometimes I think we're not. In either case, the thought is staggering."

"Nature is trying very hard to make us succeed, but nature does not depend on us. We are not the only experiment."

"When I'm working on a problem, I never think about beauty. I think only how to solve the problem. But when I have finished, if the solution is not beautiful, I know it is wrong."

"Either war is obsolete or men are."

"Dare to be naive."

"Setting a good example for children takes all the fun out of middle age."

"Empires do not suffer emptiness of purpose at the time of their creation. It is when they have become established that aims are lost and replaces by vague ritual."

"A kind word never broke anyone's mouth."

"Believe in life! Always human beings will live and progress to greater, broader and fuller life."

"I feel sorry for people who do not drink. When they wake up in the morning it is as good as they are going to feel all day."

"If you must tell me your opinions, tell me what you believe in. I have plenty of doubts of my own."