The teacher, like the artist, the philosopher, and the man of letters, can only perform his work adequately if he feels himself to be an individual directed by an inner creative impulse, not dominated and fettered by an outside authority.

Escape from boredom is one of the really powerful desires of almost all human beings.

The satisfaction to be derived from success in a great constructive enterprise is one of the most massive that life has to offer.

War does not determine who is right - only who is left.

Modern technique has made it possible for leisure, within limits, to be not the prerogative of small privileged classes, but a right evenly distributed throughout the community. The morality of work is the morality of slaves, and the modern world has no need of slavery.

All who are not lunatics are agreed about certain things : That it is better to be alive than dead, better to be adequately fed than starved, better to be free than a slave

Calculus required continuity, and continuity was supposed to require the infinitely little; but nobody could discover what the infinitely little might be.