Inner space is so much more interesting, because outer space is so empty.

Once I had all the facts in, I found I didn't have the immoral courage to pull the caper. So I wrote it as a story. As a teenager, I didn't have any skills for writing as such, so it came out in 1500 words.

Why on earth do you carry a mirror around with you?” “It's purely a defensive device. We seldom quarrel, and this is one of the reasons. Can you imagine yourself getting all worked up and contorted and illogical and then coming face to face with yourself, looking at yourself exactly as you look to everyone else?

As far as hypnosis is concerned, I had a very serious problem when I was in my twenties. I encountered a man who later became the president of the American Society of Medical Hypnosis. He couldn't hypnotize me.

You must write to the people's expertise.

A good science fiction story is a story with a human problem, and a human solution, which would not have happened at all without its science content.

Corollary 1: The existence of immense quantities of trash in science fiction is admitted and it is regrettable; but it is no more unnatural than the existence of trash anywhere.