Social evolution may be the result of intention, but it rarely, if ever, produces the result intended.

But too often the goal of the planners is a universal gray state of health corresponding to absence of disease rather than to a positive attribute conducive to joyful and creative living. This kind of health will not rule out and may even generate another form of ill, the boredom which is the penalty of a formula of life where nothing is left unforeseen.

Nature always strikes back. It takes all the running we can do to remain in the same place.

You cannot see the Milky Way in New York City any more ... We risk the loss of our sensual perception. And if you lose those, naturally, you try to compensate by other stimulations, by very loud noises, or by bright lights or drugs.

Human diversity makes tolerance more than a virtue; it makes it a requirement for survival.

What happens in the mind of man is always reflected in the disease of his body.

With reference to life there is not one nature; there are only associations of states and circumstances, varying from place to place and from time to time.