... chemistry is a trade for people without enough imagination to be physicists.

Anything that is theoretically possible will be achieved in practice, no matter what the technical difficulties are, if it is desired greatly enough.

Creationism, perhaps the most pernicious of the intellectual perversions now afflicting the American public.

The only way to define your limits is by going beyond them.

The greatest tragedy in mankind's entire history may be the hijacking of morality by religion.

I don't pretend we have all the answers. But the questions are certainly worth thinking about.

. . . the newspapers of Utopia, he had long ago decided, would be terribly dull.