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.

A civilization in which there is not a continuous controversy about important issues is on the way to totalitarianism and death

Democracy has not failed; the intelligence of the race has failed before the problems the race has raised

The object of education is to prepare the young to educate themselves throughout their lives.

The policy of repression of ideas cannot work and never has worked.

For those who are going to learn from books, learning the art of reading would seem to be indispensable.