The Appointed Task

GALADRIEL: This task was appointed to you. And if you do not find a way, no one will.
FRODO:Then I know what I must do. It's just, I'm afraid to do it.
GALADRIEL: Even the smallest person can change the course of the future.
FRODO:I cannot do this alone.
GALADRIEL: You are a Ring-bearer, Frodo. To bear a Ring of Power is to be alone.
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. 'Cause sometimes you didn't want to know the end because how could the end be happy? How can 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. A shadow even darkness must pass. A new day will come and when the sun shines it will shine out the clearer. Those were the stories that stayed with you, that meant something even if you were to small to understand why. But I think Mr. Frodo, I do understand. I know now. Folks in those stories had lots of chances in turning back only they didn't. They kept going because they were holding onto to something."
FRODO: "What are we holding onto, Sam?"
SAM: "That there's some good left in this world, Mr. Frodo, and it's worth fighting for."