Human beings sometimes find a kind of pleasure in nursing painful emotions, in blaming themselves without reason or even against reason.

A fire-eater must eat fire even if he has to kindle it himself.

I do not fear computers. I fear the lack of them.

Mathematicians deal with large numbers sometimes, but never in their income.

Never let your sense of morals get in the way of doing what's right.

All of a sudden, space isn't friendly. All of a sudden, it's a place where people can die. . . . Many more people are going to die. But we can't explore space if the requirement is that there be no casualties; we can't do anything if the requirement is that there be no casualties.

The age of the pulp magazine was the last in which youngsters, to get their primitive material, were forced to be literate.