Grimms' Fairy Tales
How we cite our quotes:
"Mirror, mirror, on the wall, who in this realm is the fairest of all?" (Snow White.181)
Because being the fairest of all is the most important thing. Oh, and it's worth killing for, too.
Meanwhile, the daughter that their mother, the queen, had brought into the world had grown to be a little girl. She had a kind heart and beautiful features and a gold star on her forehead. (The Twelve Brothers.33)
We don't know what's up with the gold star, but the beauty = goodness equation is pretty clear here.
[T]he rich man had a second wife, who brought along her two daughters. They had beautiful and fair features but nasty and wicked hearts. (Cinderella.79)
Someone can be beautiful but still evil, so watch out. Remember, things aren't always what they seem.