Two-legged creatures we are supposed to love as we love ourselves. The four-legged, also, can come to seem pretty important. But six legs are too many from the human standpoint.

Happiness is itself a kind of gratitude.

February... Now more than ever one must remind oneself that it is wasteful folly to wish that time would pass, or - as the puritanical old saying used to have it - to kill time until it kills you.

To those who study her, Nature reveals herself as extraordinarily fertile and ingenious in devising means, but she has no ends which the human mind has been able to discover or comprehend.

The cockroach and the bird were both here long before we were. Both could.

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.

There is no conceivable human action which custom has not at one time justified and at another condemned.