"One of Tolkien's most impressive achievements is that he succeeds in convincing the reader that the mistakes which Sauron makes to his own undoing are the kinds of mistake which Evil, however powerful, cannot help making, just because it is evil. A good person always enjoys one advantage over an evil person, namely, that, while a good person can imagine what it would be like to be evil, an evil person cannot imagine what it would be like to be good. Elrond, Gandalf, Galadriel, Aragorn are able to imagine themselves as Sauron and can therefore resist the temptation to use the Ring themselves, but Sauron cannot imagine that anyone who knows what the Ring can accomplish, his own destruction among other things, will refrain from using it, let alone try to destroy it. Had he been capable of imagining this, he had only to sit watching and waiting in Mordor for the Ring Bearer to arrive, and he would have been bound to catch him and recover the Ring. Instead, he assumes that the Ring has been taken to Gondor where the strongest of his enemies are gathered, for this is what he would have done had he been in their place, and launches an attack on that city, neglecting the watch on his own borders."