I do not believe they've run out of surprises.

Ethics change with technology.

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.

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

Everything starts as somebody's daydream.

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

In hindsight it may even seem inevitable that a socialist society will starve when it runs out of capitalists.

You learn by writing short stories. Keep writing short stories. The money's in novels, but writing short stories keeps your writing lean and pointed.

We learn only to ask more questions.

It's very difficult for a black man to get out of South-Central Los Angeles, and get out civilized....The only men I know who have escaped, all began reading Robert Heinlein at age ten.

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.

He who searches shall find the deity.

When you have nothing to lose you become the owner of everything.

I can’t!” Maggie was now standing on the wall. “Past the boundary wall is a bad place. I’m not allowed in the bad place.

Only solitary men know the full joys of friendship. Others have their family but to a solitary and an exile his friends are everything.

Aim not to win or succeed, but for excellence in the moment.

I have had this desire my whole life to prove people wrong, to show them I could do things they didn't think I could do.

By the way, I'm not just one man with a chalkboard. I'm one man with four chalkboards.

One murder is too many. But it is important that we learn about what has been effective.

Faith ever says, "If Thou wilt," not "If Thou canst.

And everybody has the motivation to be that killer.