The universe must be full of voices, calling from star to star in a myriad tongues. One day we shall join that cosmic conversation.

Almost any seat was comfortable at one-sixth of a gravity.

The time was fast approaching when Earth, like all mothers, must say farewell to her children.

You don't believe in organized religion, yet a major theme in so many of your works seems to be a quest for God.

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.

Now I understand,” said the last man.

It must be wonderful to be seventeen, and to know everything.