Sam, can't we just... I did what I had to. For you. Stupid self sacrificing plans come with the surname remember.
He held the power together, had anything gone wrong he'd be as lost as the rest of us. So you don't just have Cas and me to thank. You have him too. And Loki who anchored him. They took a chance and it worked.
Yeah, back when they were questionable. Before you married me. You should know by now that there's nothing I won't do for you