Harry: Professor, can I ask you something?
Professor Lupin: You want to know why I stopped you facing that boggart, yes? I would have thought that would be obvious - I assumed it would take the shape of Lord Voldemort.
Harry: I did think of Voldemort - at first. But then I remembered that night on the train... and the dementor...
Professor Lupin: I'm very impressed. That suggests that what you fear most of all... is fear itself. This is very wise.

Harry: Now what?
Hermione: We save Sirius.
Harry: How?
Hermione: No idea.

Professor Lupin: Why do you look so miserable, Harry?
Harry: None of it made any difference. Pettigrew escaped.
Professor Lupin: Didn't make any difference? Harry, it made all the difference in the world! You helped discover the truth. You saved an innocent man from a terrible fate. It made a great deal of difference.

Harry: Excuse me, sir. Where's Professor Lupin?
Professor Snape: That's really none of your concern is it, Potter?

Hermione: Harry... what's happened?
Harry: [Referring to Sirius Black] He was their friend, and he betrayed them. HE WAS THEIR FRIEND!... I hope he finds me! Because when he does, I'm gonna be ready! When he does, I'M GOING TO KILL HIM!

Professor Lupin: Very well. Kill him! But wait one more minute. Harry has the right to know why.
Harry: I know why! You betrayed my parents. You're the reason they're dead.
Professor Lupin: No, Harry, it wasn't him. Somebody did betray your parents, but it was somebody who, until quite recently, I believed to be dead.
Harry: Who was it then?
Sirius Black: Peter Pettigrew! And he's in this room, right now! Come out, come out, Peter! Come out, come out and play!

Neville, you're supposed to stroke it!

Ron

Harry: Professor, why do the dementors affect me so? More than anyone else, I mean?
Professor Lupin: Listen, dementors are among the foulest creatures to walk this earth. They feed on every good feeling, every happy memory until a person is left with nothing but his worst experiences. The dementors affect you more than others because there are true horrors in your past, horrors your classmates can scarcely imagine. You are not weak, Harry. You have nothing to be ashamed of.
Harry: I'm scared, Professor.
Professor Lupin: Well, I'd consider you a fool if you weren't.

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Harry Potter and the Prisoner of Azkaban Quotes

Dumbledore: Mysterious thing, time. Powerful, and when meddled with, dangerous. Sirius Black is in the topmost cell of the dark tower. You know the laws, Miss Granger. You must not be seen, and you would do well, I feel, to return before this last chime. If not, the consequences are too ghastly to discuss. If you succeed tonight, more than one innocent life may be spared. Three turns, should do it, I think.
[He starts to exit, turns back]
Dumbledore: Oh, by the way. When in doubt, I find retracing my steps to be a wise place to begin. Good luck.
[He exits]
Ron: What the bloody hell was that all about?

Is that really what my hair looks like from the back?

Hermione