Dolores Umbridge: What? Do something! Tell them I mean no harm!
Harry Potter: I'm sorry Professor. I must not tell lies.
Dolores Umbridge: You applied first for the defense against the dark arts post, I believe?
Professor Snape: Yes.
Dolores Umbridge: But you were unsuccessful?
Professor Snape: Obviously.
Dolores Umbridge: There is no need to talk for this.
Hermione Granger: No need to think is more like it.
Hermione Granger: This is Loony Love... Luna Lovegood.
Luna Lovegood: I'm hungry, I hope there's pudding.
Dolores Umbridge: Naughty children deserve to be punished.
Kingsley Shacklebolt: You may not like him, Minister, but you can't deny it, Dumbledore's got style.
Lord Voldemort: You're a fool, Harry Potter, and you will lose everything.
Hermione Granger: It's kind of exciting, isn't it? Breaking the rules.
Hermione Granger: At least we know one good thing that came out of today.
Harry Potter: What?
Hermione Granger: Cho coudn't keep her eyes off Harry. Could she?
Hermione Granger: He really is out there, isn't he? We've got to be able to defend ourselves. And if Umbridge refuses to teach us how, we need someone who will.
Hermione Granger: You've done it, Neville! You've found the Room of Requirement!
Ron Weasley: The what?
Hermione Granger: It's also known as the Come and Go Room. The Room of Requirement only appears when a person has real need of it, and is always equipped with the seeker's needs.
Ron Weasley: So, say you really needed a toilet...
Hermione Granger: Charming, Ronald. But yes, that is the general idea.
Harry Potter: It's brilliant! It's like Hogwarts wants us to fight back!
Answer: When Voldemort originally attacked Harry, he was acting on information provided to him by Snape. But Snape's information was not complete, ergo why Voldemort lost his powers. He wants the prophecy in order to hear it in its entirety, because he believes it will give him the information he needs to kill Harry.
Cubs Fan ★