Man not only survives and functions in his environment, he shapes it and he is shaped by it.

One may wonder indeed whether the pretense of superior health is not itself rapidly becoming a mental aberration.

Human destiny is bound to remain a gamble, because at some unpredictable time and in some unforeseeable manner nature will strike back.

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

There is a demon in technology. It was put there by man and man will have to exorcise it before technological civilization can achieve the eighteenth-century ideal of humane civilized life.

Biologically, man is still the great amateur of the animal kingdom; he is unique in his lack of anatomical and physiological specialization.

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