To my most faithful student, Twilight Sparkle,
Honesty is one of the Elements for a reason, and while it can be sometimes difficult to know when it's alright to withhold one's true views, it is a very important skill I am pleased you are learning.
Your loving mentor,
Princess CelestiaPS. I thank you for your most original and well-worded compliment. Once again your phrasing and vocabulary are at once expressive, and to the point.
PPS. I'm well aware of Twilight's proclivities. I did teach her for years, you know.