I don't believe. I know.

The meeting of two personalities is like the contact of two chemical substances: if there is any reaction, both are transformed.

One of the most difficult tasks men can perform, however much others may despise it, is the invention of good games.

I don't believe there is a God. I know there is a God.

Anyone who wants to know the human psyche will learn next to nothing from experimental psychology. He would be better advised to abandon exact science, put away his scholar's gown, bid farewell to his study, and wander with human heart through the world.

When we must deal with problems, we instinctively resist trying the way that leads through obscurity and darkness. We wish to hear only of unequivocal results, and completely forget that these results can only be brought about when we have ventured into and emerged again from the darkness. But to penetrate the darkness we must summon all the powers of enlightenment that consciousness can offer.

In each of us there is another whom we do not know. He speaks to us in dreams and tells us how differently he sees us from the way we see ourselves. When, therefore, we find ourselves in a difficult situation to which there is no solution, he can sometimes kindle a light that radically alters our attitude - the very attitude that led us into the difficult situation.