Until we get rid of religion, we won't be able to conduct the search for God.

It may be that the old astrologers had the truth exactly reversed, when they believed that the stars controlled the destinies of men. The time may come when men control the destinies of stars.

Space can be mapped and crossed and occupied without definable limit; but it can never be conquered.

What was more, they had taken the first step toward genuine friendship. They had exchanged vulnerabilities.

Moses Kaldor had always loved mountains; they made him feel nearer to the God whose nonexistence he still sometimes resented.

Behind every man now alive stand thirty ghosts, for that is the ratio by which the dead outnumber the living.

No trilogy should have more than four books.