If an elderly but distinguished scientist says that something is possible, he is almost certainly right; but if he says that it is impossible, he is very probably wrong.

The best measure of a man's honesty isn't his income tax return. It's the zero adjust on his bathroom scale.

It may be that our role on this planet is not to worship God - but to create him.

Politicians should read science fiction, not westerns and detective stories.

New ideas pass through three periods: 1) It can't be done. 2) It probably can be done, but it's not worth doing. 3) I knew it was a good idea all along!

Any sufficiently advanced technology is indistinguishable from magic.

New ideas pass through three periods: 1) It can't be done. 2) It probably can be done, but it's not worth doing. 3) I knew it was a good idea all along!

It is not easy to see how the more extreme forms of nationalism can long survive when men have seen the Earth in its true perspective as a single small globe against the stars.

Reading computer manuals without the hardware is as frustrating as reading sex manuals without the software.

I don't pretend we have all the answers. But the questions are certainly worth thinking about.

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.

I don't believe in God but I'm very interested in her.

How inappropriate to call this planet Earth when it is quite clearly Ocean.

Sometimes I think we're alone in the universe, and sometimes I think we're not. In either case the idea is quite staggering.

The only way to discover the limits of the possible is to go beyond them into the impossible.

Our lifetime may be the last that will be lived out in a technological society.