The intimate rapport with nature is one of the most precious things in life. Nature is indeed very close to us; sometimes closer than hands and feet, of which in truth she is but the extension. The emotional appeal of nature is tremendous, sometimes almost more than one can bear.

A man is not defeated by his opponents but by himself

What was everybody's business in the end proved to be nobody's business. Each one looked to the other to take the lead, and the aggressorsgot away with it.

When I look at history, I am a pessimist...but when I look at prehistory, I am an optimist.

In spite of the great advances which have been made in our knowledge, some fundamental gaps remain. Matter, life and mind still remain utter disparate phenomena, yet the concepts of all three arise in experience; and in the human all three meet and intermingle.

Instead of the animistic, mechanistic, or the mathematical universe, we see the genetic, organic, holistic universe.

...evolution is the gradual development and stratification of progressive series of wholes, stretching from the inorganic beginnings to the highest level of spiritual creation.