"For my own good. Anytime anyone had ever used those words to me, they hadn't had the slightest clue what ‘my own good’ truly was"

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Ron and Hermione were still smirking and Harry felt his temper rise; he wasn’t even sure why he was feeling so angry. “Don’t sit there grinning like you know better than I do, I was there, wasn’t I?” he said heatedly. “I know what went on, all right? And I didn’t get through any of that because I was brilliant at Defense Against the Dark Arts, I got through it all because — because help came at the right time, or because I guessed right — but I just blundered through it all, I didn’t have a clue what I was doing — STOP LAUGHING!

— J. K. Rowling