Interdependence is and ought to be as much the ideal of man as self-sufficiency. Man is a social being.

If a man voluntarily allows himself to be crushed, he yields the oil of moral energy which sustains the world.

If Euclid's point, though incapable of being drawn by any human agency, has an imperishable value, my picture has its own for mankind to live.

A full and candid admission of one's mistakes should make proof against its repetition.

Do you think I am superstitious? I am a super-atheist.

Persistent questioning and healthy inquisitiveness are the first requisite for acquiring learning of any kind.

Public opinion alone can keep a society pure and healthy.