We have not merely escaped from something but into something... We have joined the greatest of all communities, which is not that of man alone but of everything which shares with us the great adventure of being alive.

Happiness is itself a kind of gratitude.

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

Those whose conscience demands that they defy authority in some ways that involve great consequences must be willing to accept some penalty.

As machines get to be more and more like men, men will come to be more like machines.

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