I thought her letter had the most meaningful statement to make.
Dear Princess Celestia,
Today I have learned that you don't have to worry about how different your friends are comparing to each other, and actually it is a really great chance to learn how to get along with each other well and learn from the difference we all have. Who knows? You might get one of your friends to like the thing you do and maybe join you. All we need to do is respect each other, and of course with some tolerance. A little conflict could happen sometimes but it also mean it's a fresh start for accepting each other, and things will get better afterwards. Before I never understand why somebody will do something that is really not my thing to do, but after some experience with it, I guess it's not bad at all~ Of course if you really don't like it, you can tell your friends in a polite way, that's the best way to do. And also one thing else I have learned, sometimes, a little conflict can also improve you and your friend's friendship or gain more trust from each other.
*Sincerely, Your loyal citizen
Joyful Wings*