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

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

To the desert go profits and hermits, through deserts go pilgrims and exiles. Here the leaders of the great religions have sought the therapeutic and spiritual values of retreat, not to escape but to find reality.

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

There is a secret person undamaged in every individual.

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

Man is a distance runner as a consequence of hundreds of thousands of years of chasing antelopes, horses, elephants, wild cattle, and deer.