One must be reasonable in one's demands on life. For myself, all that I ask is: (1) accurate information; (2) coherent knowledge; (3) deep understanding; (4) infinite loving wisdom; (5) no more kidney stones, please.

My own best books have not been published. In fact, they've not even been written yet.

Climbing K2 or floating the Grand Canyon in an inner tube; there are some things one would rather have done than do.

Wilderness is not a luxury but a necessity of the human spirit.

All we have, it seems to me, is the beauty of art and nature and life, and the love which that beauty inspires.

That which today calls itself science gives us more and more information, and indigestible glut of information, and less and less understanding.

An economic system which can only expand or expire must be false to all that is human.