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When Harry is brought to Dumbledore's office after dreaming about Mr. Weasley being attacked, what does Dumbledore mean with "but in essence divided"? [J.K. Rowling explained its meaning during an online chat at TheLeakyCauldron.com shortly after Harry Potter and the Deathly Hallows was published. Says Rowling, "Dumbledore suspected that the snake's essence was divided – that it contained part of Voldemort's soul, and that was why it was so very adept at doing his bidding. This also explained why Harry, the last and unintended Horcrux, could see so clearly through the snake's eyes, just as he regularly sees through Voldemort's. Dumbledore is thinking aloud here, edging towards the truth with the help of the Pensieve."]
Answered by raywest