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

The most important part of our lives-our sensations, emotions, desires, and aspirations-takes place in a universe of illusions which science can attenuate or destroy, but which it is powerless to enrich.

The famous balance of nature is the most extraordinary of all cybernetic systems. Left to itself, it is always self-regulated.

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.

If we are deprived of hope as well as fear, we are compensated by being given an almost endless patience for enduring or simply for waiting.

It is sometimes easier to head an institute for the study of child guidance than it is to turn one brat into a decent human being.

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.