from this new and overwhelming certainty Luther received a new entrance to the Bible, and all other approaches seemed to him to violate the real core of the Scriptures (think of his criticism on the Epistle of James!) In Paul this is quite different. Before his conversion he had not been mired down at all, as far as he was aware. This clearly appears from his own witness in Philippians 3. The great change of which Paul’s preaching bears testimony is not in the first place the reversal in his mind
Pages 48–49