On Earth, we are unmanned by our longing for a pastoral past that never really existed; and that, if it had existed, could never exist again...on the Moon, there is no past to long for or dream about. There is no direction but forward.

The facts, gentlemen, and nothing but the facts, for careful eyes are narrowly watching.

I don’t like anything that’s got to be. I want to know why.

Writing is my only interest. Even speaking is an interruption.

Science fiction writers foresee the inevitable, and although problems and catastrophes may be inevitable, solutions are not.

It is the chief characteristic of the religion of science that it works.

When stupidity is considered patriotism, it is unsafe to be intelligent.