The limits of the possible can only be defined by going beyond them into the impossible.

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

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

The greatest tragedy in mankind's entire history may be the hijacking of morality by religion.

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

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.

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.

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

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

It has yet to be proven that intelligence has any survival value.

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

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

Human judges can show mercy. But against the laws of nature, there is no appeal.

I have a fantasy where Ted Turner is elected President but refuses because he doesn't want to give up power.

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.

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

Perhaps, as some wit remarked, the best proof that there is Intelligent Life in Outer Space is the fact it hasn't come here. Well, it can't hide forever - one day we will overhear it.

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!