Whenever man forgets that man is an animal, the result is always to make him less humane.

There are some optimists who search eagerly for the skunk cabbage which in February sometimes pushes itself up through the ice, and who call it a sign of spring. I wish that I could feel that way about it, but I do not. The truth of the matter, to me, is simply that skunk cabbage blooms in the winter time.

Logic is the art of going wrong with confidence.

Whenever man forgets that man is an animal, the result is always to make him less humane.

A tragic writer does not have to believe in God, but he must believe in man.

Not to have known - as most men have not - either the mountain or the desert is not to have known one's self. Not to have known one's self is to have known no one.

It is not a sentimental, but a grimly literal fact that unless we share this terrestrial globe with creatures other than ourselves, we shall not be able to live on it for long.