Death does not trouble me. I have no fear of supernatural punishments, of course, nor could I enjoy an eternal life in which there would be nothing left for me to do, the task of living having been accomplished.

A scientist may not be sure of the answer, but he's often sure he can find one. And that's a condition which is clearly not enjoyed by philosophy.

Do not intervene between a person and the consequences of their own behavior.

I did not direct my life. I didn't design it. I never made decisions. Things always came up and made them for me. That's what life is.

Old age is rather like another country. You will enjoy it more if you have prepared yourself before you go.

The alphabet was a great invention, which enabled men to store and to learn with little effort what others had learned the hard way-that is, to learn from books rather than from direct, possibly painful, contact with the real world.

The extent to which human aggression exemplifies innate tendencies is not clear.