With this being Holy Week, my thoughts have been focused on transformation for the last several days. Christians undergo a transformation when we're saved. Christ himself underwent a transformation on Resurrection Day, suddenly no longer confined by a physical body and its limitations. Transformation is something that everyone on earth undergoes at some point or another. A tipping point, as it were, from evil to good or from good to evil. Literature itself is ripe with the concept.
Think of Gandalf the Grey transforming into Gandalf the White. Gandalf the Grey is impressive in his own right, but he is viewed by many, hobbits especially, as harmless. He is merely an old wizard who specializes in magic tricks. Gandalf the White is something else entirely. He has metamorphosed into a pure version of himself, the version of Gandalf that was always just below the surface but needed death and resurrection to be released.
I've always been partial to Gandalf the Grey, probably because he's kick-ass tough and abounding with sarcasm. But I also appreciate the wisdom of Gandalf the White, who was only born out of sacrifice and death. Gandalf the White is the full interpretation of Gandalf. People who focus only on either Grey or White are missing Gandalf's journey, and thereby missing his point. He is the perfect example in literature of transformation from someone being merely a neutral color to being perfect purity. He is symbolic of Christ's transformation. Whatever else Peter Jackson might have done to Tolkien's work, he got Gandalf right, and for that I will always love him.