“Any sensible ruler would have killed off Leonard, and Lord Vetinari was extremely sensible and often wondered why he had not done so. He'd decided that it was because, imprisoned in the priceless, inquiring amber of Leonard's massive mind, underneath that bright investigative genius was a kind of willful innocence that might in lesser men be called stupidity. It was the seat and soul of that force which, down the millennia, had caused mankind to stick its fingers in the electric light socket of the Universe and play with the switch to see what happened - and then be very surprised when it did.”

“Some people are confident because they are fools. Leonard had the look of someone who was confident because, so far, he'd never found reason not to be. He would step off a high building in the happy state of mind of someone who intended to deal with the problem of the ground when it presented itself.”

“He'd never asked for an exciting life. What he really liked, what he sought on every occasion, was boredom. The trouble was that boredom tended to explode in your face. Just when he thought he'd found it he'd be suddenly involved in what he supposed other people - thoughtless, feckless people - would call an adventure. And he'd be forced to visit many strange lands and meet exotic and colourful people, although not for very long because usually he'd be running. He'd seen the creation of the universe, although not from a good seat, and had visited Hell and the afterlife. He'd been captured, imprisoned, rescued, lost and marooned. Sometimes it had all happened on the same day.”

“I'm sure Mr da Quirm draws lovely pictures, but I for one would need a little more evidence of his amazing genius before we entrust the world to his...device. Show me one thing he can do that anyone couldn't do, if they had the time.''I have never considered myself a genius,' said Leonard, looking down bashfully and doodling on the paper in front of him.'Well, if I was a genius I think I'd know it-' the Dean began, and then stopped.Absent-mindedly, while barely paying attention to what he was doing, Leonard had drawn a perfect circle.”

“I had noticed that I had no difficulty conversing with robots, because absolutely nothing surprised them. They were incapable of surprise. A very sensible quality.”

“Listening to Leonard, Madeleine felt impoverished by her happy childhood. She never wondered why she acted the way she did, or what effect her parents had had on her personality. Being fortunate had dulled her powers of observation.”