Sam: 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…. I know now folk in those stories had lots of chances of turning back, only they didn’t. They kept going because they were holding on to something.
Frodo: What are we holding onto, Sam?
Sam: That there’s some good in the world, Mr. Frodo, and it’s worth fighting for.