There is plenty to be learned even from a bad teacher: what not to do, how not to be.

I know what you are known as . . . but to me, you will always be Tom Riddle. It is one of the irritating things about old teachers. I am afraid that they never quite forget their charges’ youthful beginnings.

Yes, yes, I know what you’re thinking! ‘It’s all right for him, he’s an internationally famous wizard already!’ But when I was twelve, I was just as much of a nobody as you are now. In fact, I’d say I was even more of a nobody! I mean, a few people have heard of you, haven’t they? All that business with He-Who-Must-Not-Be-Named!” He glanced at the lightning scar on Harry’s forehead. “I know, I know — it’s not quite as good as winning Witch Weekly’s Most-Charming-Smile Award five times in a row, as I have — but it’s a start, Harry, it’s a start.

There are much more terrible things than physical injury.

Bedaure nicht die Toten, Harry. Bedaure die Lebenden, und vor allem diejenigen, die ohne Liebe leben ...

I was afraid that your hot head might dominate your good heart