It is the supreme art of the teacher to awaken joy in creative expression and knowledge.

Do not grow old, no matter how long you live.

There is one ray of hope. It seems to me that today the responsible leaders of the several peoples have, in the main, the honest will to abolish war.

A finely tempered nature longs to escape from the personal life into the world of objective perception and thought.

What I see in Nature is a magnificent structure that we can comprehend only very imperfectly, and that must fill a thinking person with a feeling of humility. This is a genuinely religious feeling that has nothing to do with mysticism.

That is the way to learn the most, that when you are doing something with such enjoyment that you don't notice that the time passes.

How can it be that mathematics, being after all a product of human thought which is independent of experience, is so admirably appropriate to the objects of reality?