When this article [of justification] regarding our soul’s salvation will be taken and kept with certainty and firmness of faith, so other articles come and follow naturally afterwards, as of the Trinity.Walther here highlights the centrality of ... The Lutheran Doctrine of Justification -- for all Christian teaching! So if the doctrine of the Trinity follows naturally afterwards from it, so must also the teaching of Christology.
Underlining follows Walther's emphasis in original.
Hypertext links have been copiously added for reference to original sources and on several subjects.
Highlighting is mine.
The next Section C (Part 4) continues in the next blog, and shows more of where Luther found this doctrine in our Holy Scriptures...