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 universe 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.
Terry PratchettGod moves in extremely mysterious, not to say, circuitous ways. God does not play dice with the universe; He plays an ineffable game of His own devising, which might be compared, from the perspective of any of the other players, ie., everybody, to being involved in an obscure and complex version of poker in a pitch-dark room, with blank cards, for infinite stakes, with a Dealer who won't tell you the rules, and who smiles all the time.
Terry PratchettThe real world was far too real to leave neat little hints. It was full of too many things. It wasn't by eliminating the impossible that you got to the truth, however improbable; it was by the much harder process of eliminating the possibilities.
Terry PratchettYou’d better tell me what you know, toad,” said Tiffany. “Miss Tick isn’t here. I am.” “Another world is colliding with this one,” said the toad. “There. Happy now? That’s what Miss Tick thinks. But it’s happening faster than she expected. All the monsters are coming back.” “Why?” “There’s no one to stop them.” There was silence for a moment. “There’s me,” said Tiffany.
Terry Pratchett