I'm not trying to counsel any of you to do anything really special except dare to think. And to dare to go with the truth. And to dare to really love completely.

I'm not trying to copy Nature, I'm trying to find the principles she's using.

The most important thing about Spaceship Earth - an instruction book didn't come with it.

Coping with the totality of Spaceship Earth and universe is ahead for all of us.

Nature does have manure and she does have roots as well as blossoms, and you can't hate the manure and blame the roots for not being blossoms.

When I am working on a problem, I never think about beauty but when I have finished, if the solution is not beautiful, I know it is wrong.

Our little Spaceship Earth is only eight thousand miles in diameter, which is almost a negligible dimension in the great vastness of space.