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 & danger they were. Sometimes you didn’t want to know the end, 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. & when the sun shines, it’ll shine out the clearer. Those are 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 they didn’t. They kept going. Because they were holding on to something.

FRODO: What are we holding on to, Sam?

SAM: There’s some good in this world, Mr. Frodo. & it’s worth fighting for.

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If you don't see it through to the end well, you've already lost.
Never give up. It is worth fighting for always.