Must is not the same as can, Lyra'. 'But if you must and you can, then there's no excuse! - Philip Pullman

Iorek Byrnison: Can is not the same as must.
Lyra Silvertongue: But if you must and you can, then there's no excuse.

Make a noise in there and I won’t help you. You’re on your own.

When we were alive, they told us that when we died we'd go to heaven. And they said that heaven was a place of joy and glory and we would spend eternity in the company of saints and angels praising the Almighty, in a state of bliss. That's what they said. And that's what led some of us to give our lives, and others to spend years in solitary prayer, while all the joy of life was going to waste around us and we never knew. Because the land of the dead isn't a place of reward or a place of punishment, it is a place of nothing. The good come here as well as the wicked, and all of us languish in this gloom forever, with no hope of freedom, or joy, or sleep, or rest, or peace. But now this child has come offering us a way out and I'm going to follow her. Even if it means oblivion, friends, I'll welcome it, because it won't be nothing. We'll be alive again in a thousand blades of grass, and a million leaves; we'll be falling in the raindrops and blowing in the fresh breeze; we'll be glistening in the dew under the stars and the moon out there in the physical world, which is our true home and always was.