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

Love is ...not a fact in nature of which we become aware, but rather a creation of the human imagination.

Happiness is itself a kind of gratitude.

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

Technology made large populations possible; large populations now make technology indispensable.

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.

The flowers never waste their sweetness on the desert air or, for that matter, on the jungle air. In fact, they waste it only when nobody except a human being is there to smell it. It is for the bugs and a few birds, not for men, that they dye their petals or waft their scents.