The very process of living is a continual interplay between the individual and his environment, often taking the form of a struggle resulting in injury or disease.

Sometimes the more measurable drives out the most important.

As far as life is concerned, there is no such thing as "Nature". There are only homes. Home is that environment to which the individual has become adapted; and almost everything is unnatural outside his range of adaptation. Harmonious equilibrium with nature is an abstract concept with a Platonic beauty but lacking the flesh and blood of life. It fails, in particular, to convey the creative emergent quality of human existence.

Human life is now molded to a large extent by the changes that man has brought about in his external environment and by his attempts at controlling body and soul.

... 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.

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

In man, at least, satisfaction is commonly followed by boredom.