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.

... men as a rule are more preoccupied with the dangers that threaten their life than interested in the biological forces on which they depend for a constructive existence.

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

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

A sense of continuity with the rest of creation is a form of religious experience essential to sanity.

It is possible to analyze the biological and social influences that make each human being unique, unprecedented, and unrepeatable, but this analysis does not explain how and why each feels different from all other human beings.

Man shapes himself through decisions that shape his environment.