It is not ignorance but knowledge which is the mother of wonder.

If we do not permit the earth to produce beauty and joy, it will in the end not produce food, either.

Nothing is too great or too good to be true. Do not believe that we can imagine things better than they are. In the long run, in the ultimate outlook, in the eye of the Creator, the possibilities of existence, the possibilities open to us, are beyond our imagination.

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.

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.

To be reminded that one is very much like other members of the animal kingdom is often funny...though...I do not too much mind being somewhat like a cat.

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