"I say there are spots that don't come off.... Spots that never come off, d'you know what I mean?"

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Course Dumbledore trusts you,” growled Moody. “He’s a trusting man, isn’t he? Believes in second chances. But me — I say there are spots that don’t come off, Snape. Spots that never come off, d’you know what I mean?

— J. K. Rowling