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Given the following post, respond as if you're commenting on Reddit:
human
[LOTR] What would have Gandalf done if he *had* taken the ring from Frodo.

Frodo offered Gandalf the ring, which Gandalf refused, saying that he would be too tempted to use its power. 

If Gandalf had taken the ring, how would he have used it? How much of its power could he have accessed? What would he have turned into?
gpt
Professor Tolkien gives us a direct answer. Gandalf, a Maiar like Sauron, was one of the few who could have wrested the Ring from its master, and withheld it from Sauron. Sauron would have been destroyed, and Gandalf would gain full power of the Ring.

> Gandalf as Ring-Lord would have been far worse than Sauron. He would have remained 'righteous', but self-righteous. He would have continued to rule and order things for 'good', and the benefit of his subjects according to his wisdom (which was and would have remained great).

> [The draft ends here. In the margin Tolkien wrote: 'Thus while Sauron multiplied [illegible word] evil, he left "good" clearly distinguishable from it. Gandalf would have made good detestable and seem evil.']