J.K. Rowling

What was there to be gained by fighting the most evil wizard who has ever existed? Only innocent lives, Peter.

I solemnly swear that I am up to no good.

THEN YOU SHOULD HAVE DIED! DIED RATHER THAN BETRAY YOUR FRIENDS, AS WE WOULD HAVE DONE FOR YOU!

We tried to shut him [Percy] in a pyramid. But Mum spotted us.

Well, you look in excellent health to me, Potter, so you'll excuse me if I don't let you off homework. I assure you that if you die, you need not hand it in.

It will happen tonight. The Dark Lord lies alone and friendless, abandoned by those who once followed. Tonight, before midnight, his servant will break free and rejoin his master, and with that servant's help, the Dark Lord will rise again, greater and more terrible than ever before...

When a wizard goes over ter the Dark Side there's nothin' and no one matters to 'em anymore.…

And Potter, do try and win, won't you? Or we'll be out of the running for the eighth year in a row, as Professor Snape was kind enough to remind me only last night...

An unworthy trick! A low and cowardly attempt to sabotage the Gryffindor Seeker! Detention for all of you [Draco Malfoy, Vincent Crabbe, Gregory Goyle and Marcus Flint] and fifty points from Slytherin! I shall be speaking to Professor Dumbledore about this, make no mistake! Ah, here he comes now!

You should have realised, Peter, if Voldemort didn't kill you, we would.

Tell them whatever you like. But make it quick, Remus. I want to commit the murder I was imprisoned for. (Pg. 350)

If you want to kill Harry, you'll have to kill us, too!