I've always found it a helpful metaphor to think of Evil (= Melkor) in Arda as a drop of black ink in a glas of water: a core but concentrated globule of pure black, which gradually dissipates throughout the whole (cf. the phrase "the whole of Arda was Morgoth's Ring) until we get uniform grey (i.e. our own time).
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The entire plot of The Lord of the Rings could be said to turn on what Sauron didn’t know, and when he didn’t know it.
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