"It was important, Dumbledore said, to fight, and fight again, and keep fighting, for only then could evil be kept at bay, though never quite eradicated. . . ."

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I seem to remember telling you both that I would have to expel you if you broke any more school rules,” said Dumbledore. Ron opened his mouth in horror. “Which goes to show that the best of us must sometimes eat our words,” Dumbledore went on, smiling.

— J. K. Rowling