There are some ideas so stupid that only intellectuals can believe in them, particularly left-wing intellectuals.

Give fear no hold on you. Keep sinews loose and senses open, ready at every instant to flow with the rush of action.

Why do people in this age think their own impoverished lives must be the norm of the universe?

In Harvest of Stars, there is this notion, not original with me of course, that it will become possible to download at least the basic aspects of a human personality into a machine program.

A fanatic is a man who, when he's lost sight of his purpose, redoubles his effort.

Two lives met across death and centuries. To ask what it meant is meaningless. There is no destiny. But sometimes there is bravery

So much American science fiction is parochial - not as true now as it was years ago, but the assumption is one culture in the future, more or less like ours, and with the same ideals, the same notions of how to do things, just bigger and flashier technology. Well, you know darn well it doesn't work that way.