Discuss Theology

I have been re-reading Luther on Galatians.  I read this the other day as he comments on 2:20:

“Faith also must be purely taught:namely, that you are so entirely joined to Christ, that he and you are made as it were one person; so that you may boldly say, I am now one with Christ, that is to say, Christ’s righteousness victory and life are mine.  And again Christ may say, I am that sinner, that is his sins and his death are Mine, because he is united and joined unto Me, and I to him.”