“Oh. I see. People don't want to see what can't possibly exist.”

“Most horses don't walk backwards voluntarily, because what they can't see doesn't exist.”

“I don't see what's so triffic about creating people as people and then gettin' upset 'cos they act like people.”

“Don't you understand?" snarled Rincewind. "We are going over the Edge, godsdammit!""Can't we do anything about it?""No!""Then I can't see the sense in panicking," said Twoflower calmly.”

“Listen very carefully... listen to everyone and don't say much and think about what they say and how they say it and watch their eyes... it becomes like a big jigsaw, but you're the only one who can see all the pieces. You'll know what they want you to know, and what they don't want you to know, and even what they think no one knows.”

“Oh, my dear Vimes, history changes all the time. It is constantly being re-examined and re-evaluated, otherwise how would we be able to keep historians occupied? We can't possibly allow people with their sort of minds to walk around with time on their hands.”

“the whole point of the wish business was to see to it that what the client got was exactly what he asked for and exactly what he didn't really want.”