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

The impulse to mar and to destroy is as ancient and almost as nearly universal as the impulse to create. The one is an easier way than the other of demonstrating power.

The wilderness and the idea of wilderness is one of the permanent homes of the human spirit.

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

Civilizations die from philosophical calm, irony, and a sense of fair play quite as surely as they die of debauchery.

We must not judge the society of the future by considering whether or not we should like to live in it; the question is whether those who have grown up in it will be happier than those who have grown up in our society or those of the past.

Only those within whose own consciousness the sun rise and set, the leaves burgeon and wither, can be said to be aware of what living is.