All theory, dear friend, is gray, but the golden tree of life springs ever green.

We are pantheists as natural scientists, polytheists as poets, and monotheists as moral beings.

True art can only spring from the intimate linking of the serious and the playful.

Superstition is the poetry of life.

The unnatural, that too is natural.

If we meet someone who owes us a debt of gratitude, we remember the fact at once. How often we can meet someone to whom we owe a debt of gratitude without thinking about it at all!

Whatever liberates our spirit, without also giving us mastery over ourselves, is destructive.