The supreme goal of all theory is to make the irreducible basic elements as simple and as few as possible without having to surrender the adequate representation of a simple datum of experience.

The value of achievement lies in the achieving.

We must learn the difficult lesson that the future of Mankind will only be tolerable when our course, in world affairs as in others, is based upon justice and law rather than the threat of naked power.

The next world war will be fought with stones.

Peace cannot be kept by force; it can only be achieved by understanding.

To a student: Dear Miss - I have read about sixteen pages of your manuscript . . . I suffered exactly the same treatment at the hands of my teachers who disliked me for my independence and passed over me when they wanted assistants. . . . Keep your manuscript for your sons and daughters, in order that they may derive consolation from it and not give a damn for what their teachers tell them or think of them. . . . There is too much education altogether.

Growth comes through analogy; through seeing how things connect, rather than only seeing how they might be different.