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

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.

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

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.

... 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.

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

Wherever human beings are concerned, trend is not destiny.