"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."

"God is a verb."

"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"Either war is obsolete or men are."

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

"No one can wear a mask for very long."

"A modern U.S. Navy cruiser now requires 26 tons of manuals. This is enough to affect the vessel's performance."

"Hitherto shalt thou come, but no further; and here shall thy proud waves be stayed."

"Good instincts usually tell you what to do long before your head has figured it out."

"I think fearlessness and stupidity go together."

"To judge from the notions expounded by theologians, one must conclude that God created most men simply with a view to crowding hell."