Josh McDowell writes in his book, Evidence That Demands a Verdict, “One thing to keep in mind is that the church did not create the canon or books included in what we call the Scripture. Instead, the church recognized the books that were inspired from their inception. They were inspired by God when written.”
The early church councils followed something similar to the following principles to determine whether a New Testament book was truly inspired by the Holy Spirit:
1) Was the author an apostle or have a close connection with an apostle?
2) Is the book being accepted by the body of Christ at large?
3) Did the book contain consistency of doctrine and orthodox teaching?
4) Did the book bear evidence of high moral and spiritual values that would reflect a work of the Holy Spirit?
Again, it is crucial to remember that the church did not determine the canon. No early church council decided on the canon. It was God, and God alone, who determined which books belonged in the Bible. It was simply a matter of God’s imparting to His followers what He had already decided.
The human process of collecting the books of the Bible was flawed, but God, in His sovereignty, and despite our ignorance and stubbornness, brought the early church to the recognition of the books He had inspired.