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“At that moment, Harry fully understood for the first time why people said Dumbledore was the only wizard Voldemort had ever feared. The look upon Dumbledore's face as he stared down at the unconscious form of Mad-Eye moody was more terrible than Harry could have ever imagined. There was no benign smile upon Dumbledore's face, no twinkle in the eyes behind the spectacles. There was cold fury in every line of the ancient face; a sense of power radiated from Dumbledore as though he were giving off burning heat.”
― J.K. Rowling, Harry Potter and the Goblet of Fire

“Directly above them, framed in the doorway from the Brain Room, stood Albus Dumbledore, his wand aloft, his face white and furious. Harry felt a kind of electric charge surge through every particle of his body - they were saved.”
― J.K. Rowling, Harry Potter and the Order of the Phoenix

“There are much more terrible things than physical injury.”
― J.K. Rowling, Harry Potter and the Half-Blood Prince

“There is a room in the Department of Mysteries, that is kept locked at all times. It contains a force that is at once more wonderful and more terrible than death, than human intelligence, than forces of nature. It is also, perhaps, the most mysterious of the many subjects for study that reside there. It is the power held within that room that you possess in such quantities and which Voldemort has not at all. That power took you to save Sirius tonight. That power also saved you from possession by Voldemort, because he could not bear to reside in a body so full of the force he detests. In the end, it mattered not that you could not close your mind. It was your heart that saved you.”
― J. K. Rowling, Harry Potter and the Order of the Phoenix