“Do you know what I think, Potter?' said Snape, very quietly. "I think that you are a liar and a cheat and that you deserve detention with me every Saturday until the end of term. What do you think, Potter?”

“Detention, Saturday night, my office,” said Snape. “I do not take cheek from anyone, Potter . . . not even ‘the Chosen One.’”

“Oh, Potter, you rotter, oh, what have you done,You’re killing off students, you think it’s good fun — ”

“What is the difference, Potter, between monkshood and wolfsbane?"At this, Hermione stood up, her hand stretching towards the dungeon ceiling.I don't know," said Harry quietly. "I think Hermione does, though, why don't you try asking her?" A few people laughed; Harry caught sight of Seamus's eye and Seamus winked. Snape, however, was not pleased.Sit down," he snapped at Hermione. "For your information, Potter, asphodel and wormwood make a sleeping potion so powerful it is known as the Draught of Living Death. A bezoar is a stone taken from the stomach of a goat and it will save you from most poisons. As for monkshood and wolfsbane, they are the same plant, which also goes by the name of aconite. Well? Why aren't you all copying that down?"There was a sudden rummaging for quills and parchment. Over the noise, Snape said, "And a point will be taken from Gryffindor house for your cheek, Potter.”

“Do you—do you think I want to—do you think I give a—I DON'T CARE WHAT YOU HAVE TO SAY!" Harry roared."You will," said Dumbledore sadly. "Because you are not nearly as mad at me as you ought to be. If you are to attack me, as I know you are close to doing, I would like to have thoroughly earned it.”

“You know how I think they choose people for Gryffindor team?" said Malfoy loudly a few minutes later, as Snape awarded Hufflepuff another penalty for now reason at all. "It's people they feel sorry for. See, there's Potter, who's got no parents, then there's the Weasleys, who've got no money - you should be on the team, Longbottom, you've got no brains.”

“The Potter books in general are a prolonged argument for tolerance, a prolonged plea for an end to bigotry. And I think it's one of the reasons that some people don't like the books, but I think that's it's a very healthy message to pass on to younger people that you should question authority and you should not assume that the establishment or the press tells you all of the truth.”