Mad Eye' Moody on the Avada Kedavra curse: "Not nice," he said calmly. "Not pleasant. And there's no counter curse. There's no blocking it. Only one known person has ever survived it, and he's sitting right in front of me.
J. K. RowlingWith another shock of excitement, Harry saw Sirius give James the thumbs-up. Sirius was lounging in his chair at his ease, tilting it back on two legs. He was very good-looking, his dark hair fell into his eyes with a sort of casual elegance neither James's nor Harry's could ever have achieved, and a girl sitting behind him was eyeing him hopefully, though he didn't seem to have noticed.
J. K. RowlingKilled?" said Hagrid loudly, staring down at Harry. "Snape killed? What're yeh on abou', Harry?" "Dumbledore," said Harry. "Snape killed... Dumbledore.
J. K. RowlingI feel I owe you another explanation Harry," said Dumbledore hesitantly. "You may, perhaps, wondered why I never chose you as a prefect? I must confess...that I rather thought...you had enough responsibility to be going on with." Harry looked up at him and saw a tear trickling down Dumbledore's face into his long silver beard.
J. K. Rowling