“Look, that's why there's rules, understand? So that you think before you break 'em.”

“When you break rules, break 'em good and hard”

“That's why it's always worth having a few philosophers around the place. One minute it's all is truth beauty and is beauty truth, and does a falling tree in the forest make a sound if there's no one there to hear it, and then just when you think they're going to start dribbling one of 'em says, incidentally, putting a thirty-foot parabolic reflector on a high place to shoot the rays of the sun at an enemy's ships would be a very interesting demonstration of optical principles.”

“And what do you really do?" asked Tiffany. The thin witch hesitated for a moment, and then: "We look to ... the edges," said Mistress Weatherwax. "There's a lot of edges, more than people know. Between life and death, this world and the next, night and day, right and wrong ... an' they need watchin'. We watch 'em, we guard the sum of things. And we never ask for any reward. That's important.”

“Barbarism? Hah! When we kills people we do it there and then, lookin' 'em in the eye, and we'd be happy to buy 'em a drink in the next world, no harm done. I never knew a barbarian who cut up people slowly in little rooms, or tortured women to make 'em look pretty, or put poison in people's grub. Civilization? If that's civilization, you can shove it where the sun don't shine!”

“I don't hold with paddlin' with the occult," said Granny firmly. "Once you start paddlin' with the occult you start believing in spirits, and when you start believing in spirits you start believing in demons, and then before you know where you are you're believing in gods. And then you're in trouble.""But all them things exist," said Nanny Ogg."That's no call to go around believing in them. It only encourages 'em.”

“Students, eh? Love 'em or hate 'em, you can't hit them with a shovel!”