Frodo: "I can't do this, Sam..."
Sam: "I know... It's all wrong. By rights we shouldn't even be here... But we are... It's like in the great stories, Mr. Frodo. The ones that really mattered. Full of darkness and danger they were, and sometimes you didn't want to know the ending, because how could the end be happy? How could the world go back to the way it was when so much bad had happened. But in the end, it's only a passing thing, this shadow. Even darkness must pass. A new day will come and when the sun shines it'll shine out the clearer. Those were the stories that stayed with you, that meant something, even if you were too small to understand why. But I think, Mr Frodo, I do understand... I know now. Folk in those stories had lots of chances of turning back only the didn't. They kept going, because they were holding onto something...
Frodo: What are we holding onto, Sam?
Sam: That there's some good in this world, Mr Frodo... And it's worth fighting for.
But in the end it’s only a passing thing, this shadow; even darkness must pass.