Open the pod bay doors, Hal.

God said, 'Cancel Program GENESIS.' The universe ceased to exist.

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.

We over estimate technology in the short term and under estimate technology in the long term.

That's one of those meaningless and unanswerable questions the mind keeps returning to endlessly, like the tongue exploring a broken tooth.

Absolutely no religious rites of any kind, relating to any religious faith, should be associated with my funeral.

The space elevator will be built about 50 years after everyone stops laughing.