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

... each type of civilization has had diseases peculiar to it and at each period the various social groups in any community also have differed in this regard.

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

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

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

Whatever his inhibitions and tastes, Western man believes in the natural holiness of seminudism and raw vegetable juice, because these have become for him symbols of unadultered nature.

...Search for the cause may be a hopeless pursuit because most disease states are the indirect outcome of a constellation of circumstances.