She had asked: What is he? A friend or an enemy? The alethiometer answered: He is a murderer. When she saw the answer, she relaxed at once. He could find food, and show her how to reach Oxford, and those were powers that were useful, but he might still have been untrustworthy or cowardly. A murderer was a worthy companion. She felt as safe with him as she'd done with Iorek Byrnison the armoured bear.

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

But I know that all the things I do know are very small compared with the things that I don't know.

He meant the Kingdom was over, the Kingdom of Heaven, it was all finished. We shouldn't live as if it mattered more than this life in this world, because where we are is always the most important place.... We have to be all those difficult things like cheerful and kind and curious and patient, and we've got to study and think and work hard, all of us, in all our different worlds, and then we'll build... The Republic of Heaven.

Life is hard . . . but we cling to it all the same

If you can't think of what to write, tough luck; write anyway.

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.