The dinosaurs became extinct because they didn't have a space program.

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.

I like men to behave like men. I like them strong and childish.

Religion equals logic... but the logic of the human mind can't perceptible it

There are at least two kinds of cowards. One kind always lives with himself afraid to face the world. The other kind lives with the world afraid to face himself.

I have to be perfectly honest: You should have an anniversary to acknowledge the way I work the ebonics.

There is nothing more profane than the image of an atheist with tears in his eyes conducting the glory and passion of Handel's Messiah.

The crime of bribery of foreign officials is an offence under the Commonwealth Criminal Code.

Volleyball rules are simple. If it is on the floor, pick it up and get it into the air. If it is in the air, keep it off the floor. —

The first thing necessary for a constructive dealing with time is to learn to live in the reality of the present moment. For psychologically speaking, this present moment is all we have.

It is difficult to get the news from poetry, yet men die miserably every day for lack of what is found there.