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

"I am the only guinea pig I have."

"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"Either war is obsolete or men are."

"The talent is in the choices."

"When one has nothing left to lose one becomes courageous. We are timid only when we have something left to cling to."

"A good name, like good will, is attained by many actions and may be lost by one."

"Nothing is too small to know, and nothing is too big to attempt."

"Hold a picture of yourself long and steadily enough in your mind's eye, and you will be drawn toward it."

"Sometimes what's right isn't as important as what's profitable."