All around us, aspects of the modern world - diet, exercise, medicine, art, work, family, philosophy, economics, ecology, psychology - have begun a long circle back toward their former coherence. Whether they can arrive before the natural world is damaged beyond repair and madness destroys humanity, we cannot tell.

Men are born human. What they must learn is to be an animal. If they learn otherwise it may kill them, and kill life on the planet.

All around us, aspects of the modern world - diet, exercise, medicine, art, work, family, philosophy, economics, ecology, psychology - have begun a long circle back toward their former coherence. Whether they can arrive before the natural world is damaged beyond repair and madness destroys humanity, we cannot tell.

The natural world is not only a set of constraints but of contexts within which we can more fully realize our dreams.

Men ran after and ate horses for four hundred thousand years. The outcome is more than a love of horse flesh; it is a runner's body.

The desert sky is encircling, majestic, terrible.

When men do not run they are likely to die prematurely from dysfunction of the heart and vascular systems or from disabling chronic disease.