It would have been very much better for the world if Britain had remained neutral and the Germans had won a quick victory. We should not have had either the Nazis or the Communists if that had happened.

Science is what we know, and philosophy is what we don't know.

Mankind has become so much one family that we cannot insure our own prosperity except by insuring that of everyone else.

To write tragedy, a man must feel tragedy. To feel tragedy, a man must be aware of the world in which he lives. Not only with his mind, but with his blood and sinews.

Humanistic ethics is based on the principle that only humans themselves can determine the criterion for virtue and not an authority transcending us.

If I were granted omnipotence, and millions of years to experiment in, I should not think Man much to boast of as the final result of all my efforts.

The infliction of cruelty with a good conscience is a delight to moralists - that is why they invented hell.