Actually, Sauron seems to have had a genuine (if shallow) repentence
after the War of Wrath.
Quote:
When Thangorodrim was broken and Morgoth overthrown, Sauron put on his fair hue again and did obeisance to Eonwe, the herald of Manwe, and abjured all his evil deeds. And some hold that this was not at first falsely done, but that Sauron in truth repented, if only out of fear, being dismayed by the fall of Morgoth and the great wrath of the Lords of the West.
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And having just rewatched the movie "Death on the Nile",
the French detective, Poirot, advises the chief planner of the convoluted murder plot:
"Do not let evil into your heart, it will make a home there."