Man lives by habits indeed, but what he lives for is thrill and excitements. ... From time immemorial war has been ... the supremely thrilling excitement.

Faith means belief in something concerning which doubt is still theoretically possible ... faith is the readiness to act in a cause the prosperous issue of which is not certified to us in advance.

I take it that no man is educated who has never dallied with the thought of suicide.

The union of the mathematician with the poet, fervor with measure, passion with correctness, this surely is the ideal.

Men habitually use only a small part of the power which they actually possess.

I have often thought the best way to define a man's character would be to seek out the particular mental or moral attitude in which, when it comes upon him, he felt himself most deeply and intensely active and alive. At such moments there is a voice inside which speaks and says: This is the real me!.

Most people live, whether physically, intellectually or morally, in a very restricted circle of their potential being.