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

“Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.”
― Albert Einstein

“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

“He might have crawled up into the airing cupboard and died, but I mustn't get my hopes up.”
― J.K. Rowling, Harry Potter and the Order of the Phoenix