On the fourth post of Doctrine for Everybody, concluded that the books the Lord says are Scripture are Scripture; that the Church doesn’t dictate the table of context, they confirm the index. For this reason we noted that the strongest support for the Old Testament Scriptures as we have them in the Protestant Bible are directly connected to the fact that it was the Bible that Our Lord Jesus Christ was using and confirmed as Scripture.
Now the New Testament Scriptures’ canonicity is a bit harder to establish—but not in the way that folk (like Dan Brown—who says that the Church voted on which books would comprise the New Testament) like to suggest. We don’t have Christ confirming books after they’re written, but we do have our Lord confirming the work of a certain core group.
The Lord chose this group (Acts 9:15; 10:40,41), Called them (Luke 6:12-16; Rom 1:1) for a specific work (Gal 1:1; Acts 22:14, 15; John 15:27), indicates replacements when he has to (Acts 1:24), empowered them (Matt 10:1; Mk 6:7; Acts 2, 3), gave them authority, spoke through them (Matt 10:19, 20; 1 Cor 2:10-13, 16) and worked to remind them (John 14:26) about everything they knew of Christ “since the beginning.” So when some folk decided to lie to the Apostles, the real sin was underscored: by lying to the ones with the authority, they were lying to God who placed them in authority (Acts 5:3,4)
This core group are not (ridiculously) called “Scripture Writers” (as some, setting up a Straw Man, state about their opponents), they are called The Apostles.
We then see this core group of believers, these apostles who are entrusted with laying the foundation of the Church (Eph 2:20), confirming their fellow apostles as being workers of the Lord (Gal 2:709; Acts 15:22-32) or equating the writings of those other Apostles with the Scripture of the Old Testament(2 Pet 3:15-16). Moreover, this is why we see the Apostles looking at the work of not-Apostles and, by the Authority of God, confirming their writing as Scripture (1 Tim 5:17-18 which is a quote of Luke 10:7).
We don’t have a written record of this confirmation with the book of Mark, the book of Hebrews, the book of James or the book of Jude—that’s it. The rest of the books are either written by an Apostle, or confirmed by an Apostle within his writings. Historically, the book of Mark was considered as a record of Peter’s notes, James may have been given priority because he was the Lord’s brother—and was obviously approved by the Apostles given his priority in meetings— as well as Jude. The book of Hebrews was considered written by Paul, but textual criticism has established that that is unlikely.
History agrees. Ignatius cites Matthew, Luke, Acts, Romans, 1 Corinthians, Colossians and 1 Thessalonians as Scripture. Polycarp cites Matthew, Mark , Luke, Acts, Corinthians, Galatians, Ephesians, Phillipians, Thessalonians, Timothy, Hebrews, 1 Peter and 1-3 John as Scripture. Even heretics (like Marcion) would cite these core books as Scripture—even if they took it upon themselves to delete some of them. Sure some folk cited other books as helpful (like the Shepherd of Hermes). But as early as 200AD, the Muratorian Canon shows all the books we have in our New Testament listed as the Books of The Bible.
This is all years before the Council of Nicea (325 AD) where it wasn’t decided which books should be the New Testament Canon, but which books had imposed themselves upon the Church as authoritative by God.
This all is just to establish this: we might not have too few books in the New Testament canon (as in the Gospel of Thomas, the Didache, etc) we might (at worst) have too many. Yet even so, these books have—as it were—imposed themselves upon the Church.
So we have our Scriptures comprised of the same Bible that Jesus used and the books that the Spirit of God mandated and imposed upon the Church under the authority (not merely the handwriting) of his chosen Apostles. Once again, we don’t have the Church defining the table of Contents but realizing that God didn’t speak in those Other Books. Now some corners of the Church (like the Ethiopian Orthodox Church) says otherwise but they are in error by assuming the authority of God in their decision.