John: I would have thought I was as trustworthy as your brother.
Sherlock: Of course you are, John!
John: You could’ve told me.
Sherlock: No, I couldn’t have.
John: Why? Because I’m not as clever as you are?
Sherlock: No. Because you had too much to lose.
John: *bitter laugh* You mean Sarah?
Sherlock: You have a life, John. You have a career, you have your habits, you have relationships. But me, I had nothing but Moriarty. I couldn’t drag you down with me.
John: But I would have gone with you anyway.