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.

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.

The desert sky is encircling, majestic, terrible.

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

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

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

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.

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

To reduce your age, increase your experiences.

Between two evils, I always pick the one I never tried before.

The Economist is undoubtedly the smartest weekly newsmagazine in the English language. I always look forward to its quirky year-end double issue.

When Nature begins to reveal her open secret to a man, he feels an irresistible longing for her worthiest interpreter, Art.

You are the Hero of your own Story.

The secret is to be prepared, to draw on the strengths of the people around you, and most importantly, to instill confidence that your team will step up and find a solution.

My mom didn't write, but she loved to read. She liked books 'that made you a little nervous.' Stephen King, Dean Koontz and Peter Straub were the three wise men of our family bookshelf.

Ambition displeases when it has been sated ... having reached the peak, it aspires to descend.

The next point - that's all you must think about.

The cool kindliness of sheets, that soon smooth away trouble; and the rough male kiss of blankets.