“If a coin comes down heads, that means that the possibility of its coming down tails has collapsed. Until that moment the two possibilities were equal. But on another world, it does come down tails. And when that happens, the two worlds split apart.”

“In fact, these possibility collapses happen at the level of elementary particles, but they happen in just the same way: one moment several things are possible, the next moment only one thing happens, and the rest don't exist. Except that other worlds have sprung into being, on which they did happen.”

“One moment several things are possible, the next moment only one happens, and the rest don't exist. Except that other worlds have sprung into being, on which the did happen.”

“...when all the openings were closed, then the worlds would all be restored to their proper relations with one another, Lyra’s Oxford and Will’s would lie over each other again, like transparent images on two sheets of film being moved closer and closer until they merged–although they would never truly touch.”

“Do you think I could bear to live on after you died? Oh, Lyra, I'd follow you down to the world of the dead without thinking twice about it, just like you followed Roger; and that would be two lives gone for nothing, my life wasted like yours. No, we should spend our whole lifetimes together, good long busy lives, and if we can't spend them together, we... we'll have to spend them apart.”

“The children will come to no harm.""Except for the older ones. Like that poor kid down there.""Mr. Scoresby, that is the way this world works. And if you want to put an end to cruelty and injustice, you must take me farther on. I have a job to do.""Seems to me—" Lee said, feeling for the words, "seems to me the place you fight cruelty is where you find it, and the place you give help is where you see it needed.”

“It was such a strange tormenting feeling when your daemon was pulling at the link between you; part physical pain deep in the chest, part intense sadness and love. Everyone tested it when they were growing up: seeing how far they could pull apart, coming back with intense relief.”