Was there only one world after all which spent its time dreaming of others? - Philip Pullman

When you choose one way out of many, all the ways you don't take are snuffed out like candles, as if they'd never existed.

"And that was how sin came into the world," he said, "sin and shame and death. It came the moment their daemons became fixed."

"But..." Lyra struggled to find the words she wanted: "but it en't true, is it? Not true like chemistry or engineering, not that kind of true? There wasn't really an Adam and Eve? The Cassington Scholar told me it was just a kind of fairy tale."

"The Cassington Scholarship is traditionally given to a freethinker; it's his function to challenge the faith of the Scholars. Naturally he'd say that. But think of Adam and Eve like an imaginary number, like the square root of minus one: you can never see any concrete proof that it exists, but if you include it in your equations, you can calculate all manner of things that couldn't be imagined without it.

"Anyway, it's what the Church has taught for thousands of years. And when Rusakov discovered Dust, at last there was a physical proof that something happened when innocence changed into experience.

"Incidentally, the Bible gave us the name Dust as well. At first they were called Rusakov Particles, but soon someone pointed out a curious verse toward the end of the Third Chapter of Genesis, where God's cursing Adam for eating the fruit."

He opened the Bible again and pointed it out to Lyra. She read:

"In the sweat of thy face shalt thou eat bread, till thou return unto the ground; for out of it wast thou taken: for dust thou art, and unto dust shalt thou return...."

Lord Asriel said, "Church scholars have always puzzled over the translation of that verse. Some say it should read not 'unto dust shalt thou return' but 'thou shalt be subject to dust,' and others say the whole verse is a kind of pun on the words 'ground' and 'dust,' and it really means that God's admitting his own nature to be partly sinful. No one agrees. No one can, because the text is corrupt. But it was too good a word to waste, and that's why the particles became known as Dust."

Tirelessly they flew on and on, and tirelessly she kept pace. She felt a fierce joy possessing her, that she could command these immortal presences. And she rejoiced in her blood and flesh, in the rough pine bark she felt next to her skin, in the beat of her heart and the life of all her senses, and in the hunger she was feeling now, and in the presence of her sweet-voiced bluethroat dæmon, and in the earth below her and the lives of every creature, plant and animal both; and she delighted in being of the same substance as them, and in knowing that when she died her flesh would nourish other lives as they had nourished her.