What would the ring tempt you with?

[Thinlómien]

Originally Posted by Eönwë

But then you'd end up becoming evil yourself. You'd force everyone to do what you think is right (whether it is or not- actually, we could have a whole discussion about the nature of good and bad, but this isn't the right time...), and no-one would be able to do what they wanted. So even if you're making everyone good, you're forcing it on them, oppressing them with it, and that would be evil. So even if what's happening is good, they it's happening is evil. Free will, the Gift of Men (If we're going to Tolkien-connect this) would be gone.

Exactly why I'm happy I never came across the Ring, and probably (at least partly) why Gandalf and Galadriel didn't want to take it.