I made one great mistake in my life-when I signed the letter to President Roosevelt recommending that atom bombs be made but there was some justification-the danger that the Germans would make them.

Anyone who doesn't take truth seriously in small matters cannot be trusted in large ones either.

The main task of the spirit is to free man from his ego.

I have to apologize to you that I am still among the living. There will be a remedy for this, however.

Women always worry about things that men forget; men always worry about things women remember.

Games are the most elevated form of investigation.

You are right in speaking of the moral foundations of science, but you cannot turn around and speak of the scientific foundations of morality.