“What happened down in the dungeons between you and Professor Quirrell is a complete secret, so, naturally the whole school knows.”

“Perhaps the difference between a professor and a bus driver is that the professor can say stupid things with complete authority while the bus driver is not authorized to make brilliant insights.”

“Natural for you, perfectly natural,” the Professor whispered. “Natural to refuse the key that is given. To be blind in the darkness of knowing. To be filled with a dark light that we must shine on the people around us. A light that makes us weep and pull down our own houses.”

“Lovely. Imprisoned in a nursery school dungeon.”

“No..." said Professor Quirrell. "That is not why I am here. You have made no effort to hide your dislike for me, Miss Granger. I thank you for that lack of pretense, for I much prefer true hate to false love.”

“[on the secret to a happy, content life]Do you want to know what my secret is? I don’t mind what happens.”