Man is the only one in whom the instinct of life falters long enough to enable it to ask the question "Why?

Anxiety and distress, interrupted occasionally by pleasure, is the normal course of man's existence.

Every time a value is born, existence takes on a new meaning; every time one dies, some part of that meaning passes away.

If only the fit survive and if the fitter they are the longer they survive, then Volvox must have demonstrated its superb fitness more conclusively than any higher animal ever has.

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.

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 typical American believes that no necessity of the soul is free and that there are precious few, if any, which cannot be bought.