The brightest minds in our field have been trying to find a definition of science fiction for these past seventy years. The short answer is, science fiction stories are given as possible, not necessarily here and now, but somewhere, sometime.

The human species really could have faced global thermonuclear war. During seventy years of Cold War we grew used to it.

Never be embarrassed or ashamed by anything you choose to write.

In the world of words the imagination is one of the forces of nature.

In challenging a kzin, a simple scream of rage is sufficient. You scream and you leap.

SF isn't a genre; SF is the matrix in which genres are embedded, and because the SF field is never going in any one direction at any one time, there is hardly a way to cut it off.

One mark of a good officer, he remembered, was the ability to make quick decisions. If they happen to be right, so much the better.