Donaldson has a great deal to say about atonement, both positive and negative, in his various series. Both the Mirror of her dreams series and the Gap series speak of it a lot.
Incidentally, I think the GAP series, which is science fiction rather than fantasy is his best work. If you read it then struggle through the first book, The Real Story, which isn't very long. It does a lot of context setting for the others, which are bigger than the Covenant books.