Starlight Glimmer was once the head of a cult. She used her magic to control minds, enslave ponies, and nearly destroyed all of Equestria. Such acts are unforgivable, but somehow she was forgiven by Princess Twilight, and has become her student. It is certainly more than she deserves.
While Starlight admires the grace with which Twilight forgave her, and frankly, the grace that the Princess displays in all areas of life, she has to wonder: What's her secret?
This story was featured on Equestria Daily in a round-up for Starlight Glimmer Day 2021.