“These were dangerous thoughts, he knew. They were the kind that crept up on a Watchman when the chase was over and it was just you and him, facing one another in that breathless little pinch between the crime and the punishment.And maybe a Watchman had seen civilization with the skin ripped off one time too many and stopped acting like a Watchman and started acting like a normal human being and realized that the click of the crossbow or the sweep of the sword would make all the world so clean.And you couldn’t think like that, even about vampires. Even though they’d take the lives of other people because little lives don’t matter and what the hell can we take away from them?And, too, you couldn’t think like that because they gave you a sword and a badge and that turned you into something else and that had to mean there were some thoughts you couldn’t think.Only crimes could take place in darkness. Punishment had to be done in the light. That was the job of a good Watchman, Carrot always said. To light a candle in the dark.”

“Mind you,” said Ponder, “the universe does have a rhythm. Day and night, light and dark, life and death—” “Chicken soup and croutons,” said Ridcully. "Well, not evert metaphor bears close examination".”

“Cats do not hunt seals. They would hunt them if they knew what seals and where to find them. But they do not know, so it's okay.”

“Humans need fantasy to be human.”

“NEITHER RAIN NOR SNOW NOR GLOM OF NIT CAN STAY THESE MESENGERS ABOT THEIR DUTY”

“It's rude to stare," said the troll. Its mouth opened with a little crest of foam, and shut again in exactly the same way that water closes over a stone. "Is it? Why?" asked Rincewind. How does he hold himself together, his mind screamed at him. Why doesn't he spill?”

“I HAVE MADE THIS FOR YOU. She reached out and took a damp square of cardboard. Water dripped off the bottom. Somewhere in the middle, a few brown feathers seemed to have been glued on. 'Thank you. Er ... what is it?'ALBERT SAID THERE OUGHT TO BE SNOW ON IT, BUT IT APPEARS TO HAVE MELTED, said Death. IT IS, OF COURSE, A HOGSWATCH CARD.'Oh ...' THERE SHOULD HAVE BEEN A ROBIN ON IT AS WELL, BUT I HAD CONSIDERABLE DIFFICULTY IN GETTING IT TO STAY ON. 'Ah...'IT WAS NOT AT ALL COOPERATIVE.'Really ...?'IT DID NOT SEEM TO GET INTO THE HOGSWATCH SPIRIT AT ALL.”

“Why are our people going out there,” said Mr. Boggis of the Thieves’ Guild."Because they are showing a brisk pioneering spirit and seeking wealth and … additional wealth in a new land,” said Lord Vetinari.“What’s in it for the Klatchians?” said Lord Downey.“Oh, they’ve gone out there because they are a bunch of unprincipled opportunists always ready to grab something for northern,” said Lord Vetinari.“A mastery summation, if I may say so, my lord,” said Mr. Burleigh. The Patrician looked down again at his notes. “Oh, I do beg your pardon, I seem to have read those last to sentences in the wrong order…”

“Susan hated Literature. She'd much prefer to read a good book.”

“The trouble is you can shut your eyes but you can’t shut your mind.”

“Then Tak looked upon the stone and it was trying to come alive, and Tak smiled, and wrote All things strive.And for the service the stone had given, he fashioned it into the first Troll, and delighted in the life that came unbidden.”