But when men have realized that time has upset many fighting faiths, they may come to believe...that the best test of truth is the power of the thought to get itself accepted in the competition of the market... That at any rate is the theory of our constitution.

Be willing to commit yourself to a course, perhaps a long and hard one, without being able to foresee exactly where you will come out.

To rest upon a formula is a slumber that, prolonged, means death.

Most of the things we do, we do for no better reason than that our fathers have done them or our neighbors do them, and the same is true of a larger part than what we suspect of what we think.

To think great thoughts you must be heroes as well as idealists.

Where we stand is not as important as the direction in which we are moving.

A new and valid idea is worth more than a regiment and fewer men can furnish the former than command the latter.