I think it's a big mistake to decide too soon what you're going to do with your life.

All stable processes we shall predict. All unstable processes we shall control. Describing John von Neumann's aspiration for the application of computers sufficiently large to solve the problems of meteorology, despite the sensitivity of the weather to small perturbations.

What the world needs is a small, compact, flexible fusion technology that could make electricity where and when it is needed. The existing fusion program is leading to a huge source of centralized power, at a price that nobody except a government can afford.

The great advances in science usually result from new tools rather than from new doctrines.

The universe in some sense must have known that we were coming.

It is in the long run essential to the growth of any new and high civilization that small groups of men can escape from their neighbors and from their government, to go and live as they please in the wilderness. A truly isolated, small, and creative society will never again be possible on this planet.

The language that nature speaks is the same language that we invented for mathematics. That's just an amazing piece of luck, which we don't understand.