J.k. Rowling said this quote

“ By attempting to kill you, Voldemort himself singled out the remarkable person who sits here in front of me, and gave him the tools for the job! It is Voldemort's fault that you were able to see into his thoughts, his ambitions, that you even understand the snakelike language in which he gives orders, and yet, Harry, despite your privileged insight into Voldemort's world (which, incidentally, is a gift any Death Eater would kill to have), you have never been seduced by the Dark Arts, never, even for a second, shown the slightest desire to become one of Voldemort's followers!Of course I haven't! said Harry indignantly. He killed my mum and dad!You are protected, in short, by your ability to love! said Dumbledore loudly. The only protection that can possibly work against the lure of power like Voldemort's! In spite of all the temptation you have endured, all the suffering, you remain pure of heart, just as pure as you were at the age of eleven, when you stared into a mirror that reflected your heart's desire, and it showed you only the way to thwart Lord Voldemort, and not immortality or riches. Harry, have you any idea how few wizards could have seen what you saw in that mirror? Voldemort should have known then what he was dealing with, but he did not! ”