Harry Potter and the Prisoner of Azkaban (Harry Potter, #3)

by J.K. Rowling

‘It does not,’ said Dumbledore quietly. ‘Hasn’t your experience with the Time-Turner taught you anything, Harry? The consequences of our actions are always so complicated, so diverse, that predicting the future is a very difficult business indeed … Professor Trelawney, bless her, is living proof of that. You did a very noble thing, in saving Pettigrew’s life.’ ‘But if he helps Voldemort back to power –!’ ‘Pettigrew owes his life to you. You have sent Voldemort a deputy who is in your debt. When one wizard saves another wizard’s life, it creates a certain bond between them … and I’m much mistaken if Voldemort wants his servant in the debt of Harry Potter.’