Is that actually the case--that because the Bible books are not identified in the Book of Concord, Lutherans officially believe that the Canon is open? This, if true, would also have to be spelled out in the Book of Concord, I'm guessing.
No, no mention of it in in the BoC. Martin Chemnitz does however say as much in his "Examination of the Council of Trent". This idea is also discussed in this article; http://www.internetmonk.com/archive/thinking-about-the-canon-a-lutheran-view:
The 1580 Book of Concord is easily the longest confessional standard coming out of the Reformation, dwarfing the various Reformed statements, the post-Reformation Westminster Standards, and even clocking in at about double the length of the Canons and Decrees of the Council of Trent. So it may surprise you to learn that unlike Trent, Westminster, the 39 Articles, etc, there is no definition of the canon of Scripture in the Lutheran Confessions. This is relevant because between Catholics and Protestants, the canon debate is framed in such away that either you believe in an inerrant Protestant canon of 66 books based on their self-evident, internal witness to their own divine inspiration, or you believe that the infallible Church inerrantly defined the canon, and that it is accepted only on that authority. But as with many theological issues, the Lutheran position takes neither of the supposedly only two possible options without being a synthesis, either.
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