“It is a good principle in science not to believe any 'fact'---however well attested---until it fits into some accepted frame of reference. Occasionally, of course, an observation can shatter the frame and force the construction of a new one, but that is extremely rare. Galileos and Einsteins seldom appear more than once per century, which is just as well for the equanimity of mankind.”

“In accordance with the terms of the Clarke-Asimov treaty, the second-bestscience writer dedicates this book to the second-best science-fictionwriter.[dedication to Isaac Asimov from Arthur C. Clarke in his book Report on Planet Three]”

“Those wanderers must have looked on Earth, circling safely in the narrow zone between fire and ice, and must have guessed that it was the favourite of the Sun's children.”

“Our lifetime may be the last that will be lived out in a technological society.”

“The best measure of a man's honesty isn't his income tax return. It's the zero adjust on his bathroom scale.”

“It is not easy to see how the more extreme forms of nationalism can long survive when men have seen the Earth in its true perspective as a single small globe against the stars.”

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

“It may be that our role on this planet is not to worship God - but to create him.”

“I have a fantasy where Ted Turner is elected President but refuses because he doesn't want to give up power.”

“New ideas pass through three periods: 1) It can't be done. 2) It probably can be done, but it's not worth doing. 3) I knew it was a good idea all along!”

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