Quote from : His Dark Materials Book

This is what’ll happen,” she said, “and it’s true, perfectly true. When you go out of here, all the particles that make you up will loosen and float apart, just like your daemons did. If you’ve seen people dying, you know what that looks like. But your daemons en’t just nothing now; they’re part of everything. All the atoms that were them, they’ve gone into the air and the wind and the trees and the earth and all the living things. They’ll never vanish. They’re just part of everything. And that’s exactly what’ll happen to you, I swear to you, I promise on my honor. You’ll drift apart, it’s true, but you’ll be out in the open, part of everything alive again.