“The usual rules do not seem to apply with you, Potter. The curse that failed to kill you seems to have forged some kind of connection between you and the Dark Lord. The evidence suggests that at times, when your mind is most relaxed and vulnerable — when you are asleep, for instance — you are sharing the Dark Lord’s thoughts and emotions. The headmaster thinks it inadvisable for this to continue. He wishes me to teach you how to close your mind to the Dark Lord.”
