Few artists thrive in solitude and nothing is more stimulating than the conflict of minds with similar interests.

1. When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probably wrong. 2. The only way of discovering the limits of the possible is to venture a little way past them into the impossible. 3. Any sufficiently advanced technology is indistinguishable from magic.

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.

There is hopeful symbolism in the fact that flags do not wave in a vacuum.

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'm sure we would not have had men on the Moon if it had not been for Wells and Verne and the people who write about this and made people think about it. I'm rather proud of the fact that I know several astronauts who became astronauts through reading my books.

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