Man shapes himself through decisions that shape his environment.

Social evolution may be the result of intention, but it rarely, if ever, produces the result intended.

The earth is literally our mother, not only because we depend on her for nurture and shelter but even more because the human sepcies has been shaped by her in the womb of evolution. Our salvation depends upon our ability to create a religion of nature.

Gauss replied, when asked how soon he expected to reach certain mathematical conclusions, that he had them long ago, all he was worrying about was how to reach them!

What happens in the mind of man is always reflected in the disease of his body.

Man could escape danger only by renouncing adventure, by abandoning that which has given to the human condition its unique character and genius among the rest of living things.

... men as a rule are more preoccupied with the dangers that threaten their life than interested in the biological forces on which they depend for a constructive existence.