“World domination is such an ugly phrase. I prefer to call it world optimisation.”

“There is light in the world, and it is us!”

“A true rationalist ought to be effective in the real world.”

“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.”

“Existential depression has always annoyed me; it is one of the world's most pointless forms of suffering.”

“What people really believe doesn't feel like a BELIEF, it feels like the way the world IS.”

“- With respect, Professor McGonagall, I'm not quite sure you understand what I'm trying to do here.- With respect, Mr. Potter, I'm quite sure I don't. Unless - this is a guess, mind - you're trying to take over the world?- No! I mean yes - well, NO!- I think i should perhaps be alarmed that you have trouble answering the question.”