It is easy to make a simple machine which will run toward the light or run away from it, and if such machines also contain lights of their own, a number of them together will show complicated forms of social behavior.

Any useful logic must concern itself with Ideas with a fringe of vagueness and a Truth that is a matter of degree.

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

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

If the human being is condemned and restricted to perform the same functions over and over again, he will not even be a good ant, not to mention a good human being.

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.

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