I don't believe in astrology; I'm a Sagittarius and we're skeptical.

It is really quite amazing by what margins competent but conservative scientists and engineers can miss the mark, when they start with the preconceived idea that what they are investigating is impossible.

Any technology distinguishable from magic is insufficiently advanced.

We seldom stop to think that we are still creatures of the sea, able to leave it only because, from birth to death, we wear the water-filled space suits of our skins.

If such a thing had happened once, it must surely have happened many times in this galaxy of a hundred billion suns.

A precondition for being a science fiction writer other than an interest in the future is that, an interest - at least an understanding of science, not necessarily a science degree but you must have a feeling for the science and its possibilities and its impossibilities, otherwise you're writing fantasy. Now, fantasy is also fine, but there is a distinction, although no one's ever been able to say just where the dividing lines come.

Excessive interest in pathological behavior was itself pathological