"It was not so difficult to understand the warped view the Azadians had of what they called "human nature" - the phrase they used whenever they had t… - Iain Banks

Can’t machines build these faster?” he asked the woman, looking around the starship shell.“Why, of course!” she laughed.“Then why do you do it?”“It’s fun. You see one of these big mothers sail out those doors for the first time, heading for deep space, three hundred people on board, everything working, the Mind quite happy, and you think, I helped build that. The fact a machine could have done it faster doesn’t alter the fact that it was you who actually did it.”
“Hmm,” he said.
“Well, you may ‘hmm’ as you wish,” the woman said, approaching a translucent hologram of the half-completed ship, where a few other construction workers were standing, pointing inside the model and talking. “But have you ever been gliding or swum underwater?”
“Yes,” he agreed.
The woman shrugged. “Yet birds fly better than we do, and fish swim better. Do we stop gliding or swimming because of this?”
He smiled. “I suppose not.”
“You suppose correctly,” the woman said. “And why?” She looked at him, grinning. “Because it’s fun.

When it was first revealed that each of our own deaths had to be balanced by that of an enemy—
~ It wasn’t revealed, Huyler. It was made up. It was a tale we told ourselves, not something the gods graced us with.

I was toying with the idea of having to give up writing SF in the relatively near future, not because I wanted to but because I felt I’d have to. I think you get fewer ideas as you get older, and even though you get better at using and developing the few you do have, that’s not enough. Written SF relies heavily on ideas—you can write a perfectly good mainstream novel with no original ideas at all; you just have to tell an interesting story with interesting characters who have something to say. I don’t mean that as a criticism either: that encompasses perfectly valid, rich, and rewarding literary forms, but you can’t get away with that in science fiction. You have to have completely new ideas in there somewhere or it doesn’t really cut it as proper SF, and I was concerned about that.