You should be careful about who you pretend to be, because who you pretend to be - is actually who you are!

Like all real heroes, Charley had a fatal flaw. He refused to believe that he had gonorrhea, whereas the truth was that he did.

If I was ever to have a child, this is what I'd tell it: 'Child,' I'd say, 'don't never mess with time. Keep now now and then then. And if you ever get lost in thick smoke, child, set still till it clears. Set still till you can see where you are and where you been and where you're going, child.

I have told my sons that they are not under any circumstances to take part in massacres, and that the news of massacres of enemies is not to fill them with satisfaction or glee. I have also told them not to work for companies which make massacre machinery, and to express contempt for people who think we need machinery like that.

. . . but the Universe is an awfully big place. There is room enough for an awful lot of people to be right about things and still not agree.

Science never cheered up anyone. The truth about the human situation is just too awful.

See the cat? See the cradle?