"You could be great, you know, it’s all here in your head, and Slytherin will help you on the way to greatness, no doubt about that."

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It is dangerous to explain too clearly to man how like he is to the animals without pointing out his greatness. It is also dangerous to make too much of his greatness without his vileness. It is still more dangerous to leave him in ignorance of both, but it is most valuable to represent both to him. Man must not be allowed to believe that he is equal either to animals or to angels, nor to be unaware of either, but he must know both.

— Blaise Pascal