"A good friend and a bad friend are like a perfume-seller and a blacksmith: The perfume-seller might give you some perfume as a gift, or you might buy some from him, or at least you might smell its fragrance. As for the blacksmith, he might singe your clothes, and at the very least you will breathe in the fumes of the furnace."

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But as you age, you lose other, even more important things, like friends-hopefully only bad friends, who maybe weren't as good for you as you once thought. With luck, you'll be able to hang on to your true friends, the ones who were always there for you....even when you thought they weren't. Because friends like that are more precious then all the tiaras in the world

— Meg Cabot