Eagles come in all shapes and sizes, but you will recognize them chiefly by their attitudes.

The real problems of our planet are not economic or technical, they are philosophical. The philosophy of unbridled materialism is being challenged by events.

The best aid to give is intellectual aid, a gift of useful knowledge. A gift of knowledge is infinitely preferable to a gift of material things.

I cannot predict the wind but I can have my sail ready.

Wisdom demands a new orientation of science and technology toward the organic, the gentle, the elegant and beautiful.

If I limit myself to knowledge that I consider true beyond doubt, I minimize the risk of error but I maximize, at the same time, the risk of missing out on what may be the subtlest, most important and most rewarding things in life.

Anyone who thinks consumption can expand forever on a finite planet is either insane or an economist.