... 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.

Life is short, the art is long, the problems pressing.

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

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

It is often by a trivial, even an anecdotal decision, that we direct our activities into a certain channel, and thus determine which of the potential expressions of our individuality become manifest. Usually we know nothing of the ultimate orientation or of the outlet toward which we travel, and the stream sweeps us to a formula of life from which there is no returning. Every decision is like a murder, and our march forward is over the stillborn bodies of all our possible selves that will never be.

... 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.

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