Robin

“I know [Umbridge] by reputation and I'm sure she's no Death Eater—'
'She's foul enough to be one…'
'Yes, but the world isn't split into good people and Death Eaters', said Sirius with a wry smile. 'I know she’s a nasty piece of work though'.”
― J.K. Rowling, Harry Potter and the Order of the Phoenix

“Mr. Moony presents his compliments to Professor Snape, and begs him to keep his abnormally large nose out of other people's business.
Mr. Prongs agrees with Mr. Moony, and would like to add that Professor Snape is an ugly git.
Mr. Padfoot would like to register his astonishment that an idiot like that ever became a professor.
Mr. Wormtail bids Professor Snape good day, and advises him to wash his hair, the slimeball.”
― J.K. Rowling, Harry Potter and the Prisoner of Azkaban

“What was there to be gained by fighting the most evil wizard who has ever existed?" said Black, with a terrible fury in his face. "Only innocent lives, Peter!"
"You don't understand!" whined Pettigrew. "He would have killed me, Sirius!"
"THEN YOU SHOULD HAVE DIED!" roared Black. "DIED RATHER THAN BETRAY YOUR FRIENDS, AS WE WOULD HAVE DONE FOR YOU!”
― J.K. Rowling, Harry Potter and the Prisoner of Azkaban

“A room without books is like a body without a soul.”
― Marcus Tullius Cicero