"But do you remember Gandalf's words: Even Gollum may have something yet to do? But for him, Sam, I could not have destroyed the Ring. The Quest would have been in vain, even at the bitter end. So let us forgive him! For the Quest is achieved and now all is over. I am glad you are here with me. Here at the end of all things, Sam."
Frodo
J.R.R. Tolkien, Mount Doom, The Return of the King