"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."

"Humanity is acquiring all the right technology for all the wrong reasons."

"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"Either war is obsolete or men are."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."

"He enjoys true leisure who has time to improve his soul's estate."

"The game of life is not much in holding a good hand, as in playing a poor hand well."

"I have loved like a child collecting shells along the shore line, discarding one shell for another of seemingly more outward beauty with no knowledge of the pearls that were hidden within."

"This day before dawn I ascended a hill and looked at the crowded heaven."

"Humility is not disgraceful, and carries no loss of true pride."

"Time is that quality of nature which keeps events from happening all at once. Lately it doesn't seem to be working."