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Can't you just keep your big mouth shut?" Brian said furiously to Nan. He pointed to Chrestomanci. "How do we know he's safe? For all we know, he could be the devil that you summoned up!" "Oh, you flatter me, Brian," Chrestomanci said.

Diana Wynne Jones (2000). “Witch Week”
Can't you just keep your big mouth shut? Brian said furiously to Nan. He pointed to Chrestomanci. How do we know he's safe? For all we know, he could be the devil that you summoned up! Oh, you flatter me, Brian,