What does that mean, 'had done enough to atone for'?

"I know what you pray for. Don't hold your breath," is the first unthinking retort out of his mouth. He's so used to being told to atone that it's second-nature to remind those praying for his salvation that he'll never be the subservient, slack-jawed doormat they want all mages to be. And Cullen, especially, is the fact of that exact way of thinking.

But before he can begin to wonder if there's more to it than that, Cullen makes a move toward him. Anders maneuvers out of the way with a questioning frown, but it's not, as it turns out, a move toward him so much as toward the door.

"You're leaving? Just that like?" Anders almost can't believe this is the anticlimactic result of finding Cullen in the mansion--it's not quite what he'd been expecting. Cullen seems... different. Subdued? No, maybe more like restrained. He doesn't seem inclined to rip the chord from the curtains and try to tie his hands together with him, and that's all Anders can ask for. Best not to look a gift horse in the mouth.

He still gives the retreating templar a strange look, though.