I'm not a hero, I'm a high-functioning sociopath.

John Watson: Sherlock, what do we do?

Magnussen: Nothing! There's nothing to be done. Oh, I'm not a villain, I have no "evil plan". I'm a businessman, acquiring assets. You happen to be one of them. Sorry, no chance for you to be a hero this time, Mr. Holmes!

Sherlock: Oh, do your research. I'm not a hero, I'm a high-functioning sociopath. Merry Christmas!