The laws of history are as absolute as the laws of physics, and if the probabilities of error are greater, it is only because history does not deal with as many humans as physics does atoms, so that individual variations count for more.

Any planet is 'Earth' to those that live on it.

Thinking is the activity I love best, and writing to me is simply thinking through my fingers. I can write up to 18 hours a day. Typing 90 words a minute, I've done better than 50 pages a day. Nothing interferes with my concentration. You could put an orgy in my office and I wouldn't look up-well, maybe once.

There is an art to science, and a science in art; the two are not enemies, but different aspects of the whole.

It was childish to feel disappointed, but childishness comes almost as naturally to a man as to a child.

God, how that stings! I've spent a lifetime loving science fiction and now I find that you must expect nothing of something that's just science fiction.

Married life had taught Toran the futility of arguing with a female in a dark-brown mood.