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.

The mechanisms of vis medicatrix naturæ—the most healing power of nature—are so effective that most diseases are self-terminating.

Nature always strikes back. It takes all the running we can do to remain in the same place.

In 1946, Oxford University in England was offered large funds to create a new Institute of Human Nutrition. The University refused the funds on the ground that the knowledge of human nutrition was essentially complete, and that the proposed institution would soon run out of meaningful research projects.

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

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

Wherever human beings are concerned, trend is not destiny.