If I didn't exist, I would have invented myself.

The piece of equipment I'm most found off is my telescope. The other night I had a superb view of the moon.

Guns are the crutches of the impotent.

To find anything comparable with our forthcoming ventures into space, we must go back far beyond Columbus, far beyond Odysseus-far, indeed, beyond the first ape-man. We must contemplate the moment, now irrevocably lost in the mists of time, when the ancestor off all of us came crawling out of the sea.

This is the first age that's ever paid much attention to the future, which is a little ironic since we may not have one.

If such a thing had happened once, it must surely have happened many times in this galaxy of a hundred billion suns.

Much blood has also been spilled on the carpet in attempts to distinguish between science fiction and fantasy. I have suggested an operational definition: science fiction is something that COULD happen - but usually you wouldn't want it to. Fantasy is something that COULDN'T happen - though often you only wish that it could.