Poetry, mythology, and religion represent the world as man would like to have it, while science represents the world as he gradually comes to discover it.

Though many have tried, no one has ever yet explained away the decisive fact that science, which can do so much, cannot decide what it ought to do.

Metaphysics may be, after all, only the art of being sure of something that is not so and logic only the art of going wrong with confidence.

We need some contact with the things we sprang from. We need nature at least as a part of the context of our lives. Without cities we cannot be civilized. Without nature, without wilderness even, we are compelled to renounce an important part of our heritage.

Being the inventor of sex would seem to be a sufficient distinction for a creature just barely large enough to be seen by the naked eye.

The rare moment is not the moment when there is something worth looking at, but the moment when we are capable of seeing.

Life is very persistent and very ingenious in seizing every opportunity.