The Doctrine of Christ and Unity of the Saints
discusses unity from the perspective of 1, 2, and 3 John. 2 John 9 is approached as a golden text of the Bible; "abiding" and "the doctrine of Christ" are covered in part one. Part two considers objections--a review of an effort to reconstruct 2 john 9. Part three wraps up the study, answering the question What Does It Mean Then?
General index, scripture index, and several pages of appendices provide additional study material.