Imagination is a form of seeing - Philip Pullman

That’s the duty of the old,” said the Librarian, “to be anxious on behalf of the young. And the duty of the young is to scorn the anxiety of the old.

Men and women are moved by tides much fiercer than you can imagine, and they sweep us all up into the current.

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. At that moment all Will's choices existed at once. But to keep them all in existence meant doing nothing. He had to choose, after all.