Watson: You think you're in love with him. Only you can't be sure, because as much as you claim to know about the world, love is something you don't quite get.

Moriarty: You'd be surprised what I'd do for love.

Maester Aemon: Jon, did you ever wonder why the men of the Night's Watch take no wives and father no children?

Jon Snow: No.

Maester Aemon: So they will not love, for love is the bane of honor, the death of duty.