The only true measure of success is the ratio between what we might have done and what we might have been on the one hand, and the thing we have made and the things we have made of ourselves on the other.

The crisis of today is the joke of tomorrow.

You have, let us say, a promising politician, a rising artist that you wish to destroy. Dagger or bomb are archaic, clumsy and unreliable - but teach him, inoculate him with chess.

Our business here is to be Utopian, to make vivid and credible, if we can, first this facet and then that, of an imaginary whole and happy world.

Man ... can go up against gravitation in a balloon, and why should he not hope that ultimately he may be able to stop or accelerate his drift along the Time-Dimension, or even turn about and travel the other way.

No passion in the world is equal to the passion to alter someone else's draft.

Suddenly, like a thing falling upon me from without, came fear.