Anybody can find infinite Mandelbrot figures in his navel.

I wrote the first book, Harvest of Stars, and as I was writing it, I saw that certain implications had barely been touched on... It's perfectly obvious that two completely revolutionary things are going on, with cybernetics, and biological science.

Better a life like a falling star, brief bright across the dark, than the long, long waiting of the immortals, loveless and cheerlessly wise.

I think the first duty of all art, including fiction of any kind, is to entertain. That is to say, to hold interest. No matter how worthy the message of something, if it's dull, you're just not communicating.

Give fear no hold on you. Keep sinews loose and senses open, ready at every instant to flow with the rush of action.

There are some ideas so stupid that only intellectuals can believe in them, particularly left-wing intellectuals.

If we knew exactly what to expect throughout the Solar System, we would have no reason to explore it.