I have said that the modern man, and especially the modern American, however much 'know-how' he may have, has very little 'know-what'

It is possible to believe in progress as a fact without believing in progress as an ethical principle; but in the catechism of many Americans, the one goes with the other.

Am I really a good mathematician?

The more we get out of the world the less we leave, and in the long run we shall have to pay our debts at a time that may be very inconvenient for our own survival.

One of the chief duties of the mathematician in acting as an advisor ... is to discourage ... from expecting too much from mathematics.

Progress imposes not only new possibilities for the future but new restrictions.

Any labor which competes with slave labor must accept the economic conditions of slave labor.