After their encounter on the approach to Jupiter, there would aways be a secret bond between them---not of love, but of tenderness, which is often more enduring.

I am an optimist. Anyone interested in the future has to be otherwise he would simply shoot himself.

Any sufficiently advanced technology is indistinguishable from magic.

All explorers are seeking something they have lost. It is seldom that they find it, and more seldom still that the attainment brings them greater happiness than the quest.

We have to abandon the idea that schooling is something restricted to youth. How can it be, in a world where half the things a man knows at 20 are no longer true at 40 - and half the things he knows at 40 hadn't been discovered when he was 20?

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

The truth, as always, will be far stranger.