I love that everything I thought was a lie was the truth -- that he was summoning the Demon for Dean's sake, and that he wasn't going to hunt it. That even for John, some things matter more than the hunt, more than revenge.

YES. And that's really what broke me, I think; I was so stunned that he'd reached this decision, I could barely process it. He had to let go of so much to come to this point. It's an amazing character moment. :D