“Actors had a habit of filling all the space around them.”

“It was all very well going on about pure logic and how the universe was ruled by logic and the harmony of numbers, but the plain fact of the matter was that the Disc was manifestly traversing space on the back of a giant turtle and the gods had a habit of going round to atheists' houses and smashing their windows.”

“Of all the forces in the universe, the hardest to overcome is the force of habit.”

“But all them things exist," said Nanny Ogg. "That's no call to go around believing in them. It only encourages 'em.”

“Witches knew that mysterious omens were around all the time. The world was always very nearly drowning in mysterious omens. You just had to pick the one that was convenient.”

“The rising sun managed to peek around the vast column of smoke that forever rose from Ankh-Morpork, City of Cities, illustrating almost up to the edge of space that smoke means progress or, at least, people setting fire to things.”

“The world rides through space on the back of a turtle. This is one of the great ancient world myths, found wherever men and turtles were gathered together; the four elephants were an Indo-European sophistication. The idea has been lying in the lumber rooms of legend for centuries. All I had to do was grab it and run away before the alarms went off.There are no maps. You can't map a sense of humour. Anyway, what is a fantasy map but a space beyond which There Be Dragons? On the Discworld we know There Be Dragons Everywhere. They might not all have scales and forked tongues, but they Be Here all right, grinning and jostling and trying to sell you souvenirs.”