"There were a lot of people living in his time who never did latch on to the idea that the curve of technological progress was not a flat slanting line like a diving board, but a geometrical curve like a ski-jump. These wistful and mixed-up souls were always suffering from attacks of belated conservatism, clutching suddenly at this dying thing and that, trying to keep it or bring it back. It wasn’t real conservatism at all, of course, but an unthought longing for the dear old days when one could predict what would be there tomorrow, if not next week. Unable to get the big picture, they welcomed the conveniences, the miniaturization of this and the speed of that, and then were angrily confused when their support of these things changed their world."

“A science fiction story is a story built around human beings, with a human problem and a human solution, which would not have happened at all without its scientific content.”

“You cannot be objective about this because you have been indoctrinated, sermonized, drenched, imbued, inculcated and policed on the matter since first you wore blue booties. You come from a time and place in which the maleness of the male, and the femaleness of the female, and the importance of their difference, were matters of almost total preoccupation.”

“And Charlie asked questions! His unease had long since disappeared, and two of his most deep-dyed characteristics took over: one, the result of his omnivorous, undisciplined, indefatigable reading and picking of brains; second, the great gaping holes this had left in his considerable body of knowledge. Both appeared far more drastic than he had heretofore known; he knew ever so much more than he knew he knew, and he had between five and seven times as much misinformation and ignorance than he had ever dreamed.”

“So it was that Lone came to know himself; and like the handful of people who have done so before him he found, at this pinnacle, the rugged foot of a mountain.”

“If All Men Were Brothers, Would You Let One Marry Your Sister?”

“It's the Simple things that are really effective. Try to remember that.”