Imagination is not to be divorced from the facts. It is a way of illuminating the facts.

Education with inert ideas is not only useless; it is above all things harmful.

A great society is a society in which its men of business think greatly of their functions.

There is no more common error than to assume that, because prolonged and accurate mathematical calculations have been made, the application of the result to some fact of nature is absolutely certain.

You cannot be wise without some basis of knowledge, but you may easily acquire knowledge and remain bare of wisdom.

The paradox is now fully established that the utmost abstractions are the true weapons with which to control our thought of concrete fact.

Peace is self-control at its widest-at the width where the "self" has been lost, and interest has been transferred to coordinations wider than personality.