There is a secret person undamaged in every individual.

The human cardiovascular system evolved as part of the physiology of [prehistoric] hunters, who ran for their lives.

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

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

Who would want to live in a world that is just not quite fatal?