My Little Pony: Friendship Is Magic2010

Twilight Sparkle:
Dear Princess Celestia: This week my very talented friend Rarity learned that if you try to please everypony, you often times end up pleasing nopony, especially yourself. And I learned this: when somepony offers to do you a favor, like making you a beautiful dress, you shouldn't be overly critical of something generously given to you. In other words, you shouldn't look a gift horse in the mouth.