From the first introduction of Smeagol in The Fellowship of the Ring, there is an overarching sense that he had a purpose in this entire narrative. Frodo originally expresses regret that Bilbo did not kill him when he had the chance, but Gandalf reminds them that there very well might be some type of purpose that no one can understand.
At the end of all things, and the fires of Mount Doom, Frodo made the decision that he did not want to give up the ring after all. It had possessed him to such a great degree that he could not bear the thought of throwing it away.
“‘I have come,’ he said. ‘But I do not choose now to do what I came to do. I will not do this deed. The Ring is mine!’”
That is often times the way it is.
We need a push to make that change complete. For further, that turned out to be Smeagol biting off his finger with the ring on it before carelessly tumbling over into the fire himself.
Frodo however recognized the importance of what Smeagol did for him.
“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.”
Any temptation we have is somewhat similar. Recently, members of Teen Challenge Vermont visited my church. As long as the men who shared their testimonies still felt like they were in control, they were unwilling to confront the addiction they had struggled with. However, a sense of hitting rock-bottom came through in all of their testimonies. They finally found a point where they could not do anything else, so they sought out this wonderful program for help in overcoming these struggles in their life.
Frodo was in a very similar situation. Until he literally hit rock bottom and had that ring taken away from him, he was not able to give it up. He was addicted to it even though he knew he had to get rid of it and had to fulfill the mission. It had intoxicated him to the point that only the outside force of Smeagol was able to force that change. Kind of like hitting rock-bottom, I imagine having your finger bit off by an evil creature is not a pleasant experience, but deliverance was found through that trial.
We might want to make all the changes in the world, and we might know that it would be good for us to perhaps start or stop doing certain things. However, we have a hard time with that final push. We have a hard time actually starting or stopping. We need the outside force to help us. Even though it might not always be pleasant, the push can help put us on the right track in a way that we were unwilling or unable to do on our own.
 J.R.R. Tolkien, The Lord of the Rings (New York: Houghton Mifflin Harcourt, 2002), 945, Kindle Edition.
 Ibid., 947.