Nature will not forgive those who fail to fulfill the law of their being. The law of human beings is wisdom and goodness, not unlimited acquisition.

The most distressing aspect of the world into which you are going is its indifference to the basic issues, which now, as always, are moral issues.

More free time means more time to waste. The worker who used to have only a little time in which to get drunk and beat his wife now has time to get drunk, beat his wife - and watch TV.

A world community can exist only with world communication, which means something more than extensive short-wave facilities scattered; about the globe. It means common understanding, a common tradition, common ideas, and common ideals.

Mathematics ... is indispensable as an intellectual technique. In many subjects, to think at all is to think like a mathematician.

Whenever the urge to exercise comes upon me, I lie down for a while and it passes.

Too few have the courage of my convictions.