I always feel that I have two duties to perform with a parting guest: one, to see that he doesn't forget anything that is his; the other, to see that he doesn't take anything that is mine.

Error is the price we pay for progress.

The fact of the religious vision, and its history of persistent expansion, is our one ground for optimism. Apart from it, human life is a flash of occasional enjoyments lighting up a mass of pain and misery, a bagatelle of transient experience.

Philosophy begins in wonder. And, at the end, when philosophic thought has done its best, the wonder remains.

To be an abstraction does not mean that an entity is nothing. It merely means that its existence is only a factor of a more concrete element of nature.

No reason can be given for the nature of God, because that nature is the ground of rationality.

I consider Christian theology to be one of the great disasters of the human race.