"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."

"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."

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

"Now there is one outstandingly important fact regarding Spaceship Earth, and that is that no instruction book came with it."

"Does the imagination dwell the most upon a woman won or a woman lost?"

"Under conditions of tyranny it is far easer to act than to think."

"The philosophers have only interpreted the world, in various ways; the point is to change it."

"Foolery... does walk about the orb like the sun; it shines everywhere."

"Modesty is a vastly overrated virtue."

"The truth about your own life is not always easy to accept, and sometimes hasn't even occurred to you."