Rashness is the faithful, but unhappy parent of misfortune.

Humans beings always do the most intelligent thing…after they’ve tried every stupid alternative and none of them have worked

The more for whom we strive to serve, the greater effectiveness we will have.

It is a fact today that one in ten thousand of us can make a technological breakthrough capable of supporting all the rest.

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

You never change people by fighting their existing reality.

Man knows so much and does so little.