Rings of Power S02E01: The Tenacity of Evil
Season 2 of Rings of Power shows us a flashback of a moment in the history of Middle-earth during which Sauron seemed to be defeated and eradicated for good. Only to emerge again in another form at another time and place.
We may get discouraged to see how humanity falls for the temptation of evil time and again. But Tolkien teaches us an important lesson: that the tenacity of evil should never discourage us, since "Evil labours with vast power and perpetual success - in vain: preparing always only the soil for unexpected good to sprout in." (J.R.R. Tolkien , “The Letters of J.R.R. Tolkien”)
We have a moral obligation to keep fighting evil whenever it shows up: "It is not our part to master all the tides of the world, but to do what is in us for the succour of those years wherein we are set, uprooting the evil in the fields that we know, so that those who live after may have clean earth to till. What weather they shall have is not ours to rule." (J.R.R. Tolkien, “The Return of the King: Being the Third Part of the Lord of the Rings”)
[This episode contains mild spoilers for Rings of Power Season 2, episode 1]