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

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

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.

I wrote the first book, Harvest of Stars, and as I was writing it, I saw that certain implications had barely been touched on... It's perfectly obvious that two completely revolutionary things are going on, with cybernetics, and biological science.

We live with our archetypes, but can we live in them?

The fish that first ventured ashore had considerable practical problems.

At each stage...entirely new laws, concepts and generalizations are necessary, requiring inspiration and creativity to just as great a degree as in the previous one.