“at least nine-tenths of all the original reality ever created lies outside the multiverse, and since the multiverse by definition includes absolutely everything that is anything, this puts a bit of a strain on things.Outside the boundaries of the universes lie the raw realities, the could-have-beens, the might-bes, the never-weres, the wild ideas, all being created and uncreated chaotically like elements in fermenting supernovas.Just occasionally where the walls of the worlds have worn a bit thin, they can leak in.”

“People said there had to be a Supreme Being because otherwise how could the universe exist, eh?And of course there clearly had to be, said Koomi, a Supreme Being. But since the universe was a bit of a mess, it was obvious that the Supreme Being hadn't in fact made it. If he had made it he would, being Supreme, have made a better job of it, with far better thought given, taking an example at random, to things like the design of the common nostril. Or, to put it another way, the existence of a badly put-together watch proved the existence of a blind watchmaker. You only had to look around to see that there was room for improvement practically everywhere. This suggested that the Universe had probably been put together in a bit of a rush by an underling while the Supreme Being wasn't looking, in the same way that Boy Scouts' Association minutes are done on office photocopiers all over the country.So, reasoned Koomi, it was not a good idea to address any prayers to a Supreme Being. It would only attract his attention and might cause trouble.”

“Belief is one of the most powerful organic forces in the multiverse. It may not be able to move mountains, exactly. But it can create someone who can.People get exactly the wrong idea about belief. They think it works back to front. They think the sequence is, first object, then belief. In fact, it works the other way.”

“There are many horrible sights in the multiverse. Somehow, though, to a soul attuned to the subtle rhythms of a library, there are few worse sights than a hole where a book ought to be.”

“Witches were a bit like cats. They didn’t much like one another’s company, but they did like to know where all the other witches were, just in case they needed them.”

“Everywhere's been where it is ever since it was first put there. It's called geography.”

“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.”