After a particularly trying episode of dealing with her cat, Rarity decides to go to Fluttershy for some much-needed relaxation. There, she's introduced to a secret of Fluttershy's that nopony yet has understood.
The greatest displays of strength are not always the most overt. Fluttershy is not whom one would consider to be a strong pony. But when Rarity digs a little deeper, she discovers in her friend a strength that carries the weight of hundreds.
Rarity has found a new hobby in meditating with Fluttershy, and through months of practice, she's not only learned how to listen to nature, but also how to read ponies and the inner feelings they hide. But she never wanted to read her best friend.