FH, can you elucidate what you mean by "very carefully done"?
Not without writing a "book," as the saying goes.
So let me just quote from "Evidence That Demands A Verdict" as partial answer to you question and encourage you to read up on it on your own for a broader perspective.
"Meaning of the word "Canon"
The word
canon comes from the root word "reed) (English word "cane"; Hebrew form
ganeh and Greek
Kanon). The "reed" ws used as a measuring rod and eventually meant "standard."
Origen used the word "canon to denote what we call the 'rule of faith,' the standard by which we are to measure and evaluate...." Later it meant a "list" or "index."
One thing to keep in mind is that the church did not create teh canon or books included in what we call Scripture. Instead, the church recognized the books that were inspired from their inception. They were inspired by God when written.
"Tests of a book for inclusion in the Canon."
We don't know exactly what criteria the early church used to choose the canonical books. There were possibly five guiding principles used to determine whether or not a New Testament book is canonical or Scripture. Geisler and Nix recore these five principles:
1.
Is it authoritative - did it come from the hand of God? (Does this book come with a divine "thus saith the Lord"?)
2.
Is it prophetic - was it written by a man of God?
3.
Is it authentic [The fathers had the policy of "if in doubt, throw it out." This enhanced the "validity of their discernment of canonical."]
4.
Is it dynamic - did it come with the life-transforming power of God?
5.
Was it received, collected, read and used - was it accepted by the people of God?
Peter acknowledged Paul's work as Scripture parallel to the Old Testament Scripture (II Peter 3:16)
(Evidence That Demands A Verdict, p.29)
The chapter includes much more information relative to the books that comprise the Old Testament and the New Testament canonical books and why "other" books (i.e. the Apocrypha) were not included as part of the Canon.
Specific to the Apocrypha:
Historical testimony of their exclusion
Geisler and Nix give a succession of 10 testimonies of antiquity against accepting the Apocrypha:
1. "Philo, Alexandrian Jewish philosopher (20 B.C.-A.D.40), quoted the Old Testament prolifically and even recognized the threefold division, but he never quoted from the Apocrypha as inspired.
2. "Josephus (A.D.30-100), Jewish historian, explicitly excludes the Apocrypha, numbering the books of the Old Testament as 22. Neither does he quote these books as Scripture.
3. "Jesus and the New Testament writers never once quote the Apocrypha although there are hundreds of quotes and references to almost all of the canonical books of the Old Testament.
4. "The Jewish scholars of Jamnia (A.D.90) did not recognize the Apocrypha.
5. "No canon or council of the Christian church of the first four centuries recognized the Apocrypha as inspired.
6. "Many of the great Fathers of the early church spoke out against the Apocrypha, for example, Origen, Cyril of Jerusalem, Athanasius.
7. "Jerome (340-420), the great scholar and translator of the Vulgate, rejected the Apocrypha as part of the canon. He disputed across the Mediterranean with Augustine on this point. He at first refused even to translate the Apocryphal books into Latin, but later he made a hurried translation of a few of them. After his death, and literally "over his dead body," the Apocryphal books wer brought into his Latin Vulgate directly from the Old Latin Version.
8. "Many Roman Catholic scholars through the Reformation periond rejected the Apocrypha.
9. "Luther and the Reformers rejected the canonicity of the Apocrypha.
10. "Not until A.D.1546, in a polemical action at the Counter Remformation Council of Trent, did the Apocryphal books receive full canonical status by the Roman Catholic Church.
(Evidence That Demands A Verdict, pp.35-36)
There is a lot more information in that chapter about New Testament Canon, etc. if you want to expand on this inquiry for yourself.
With respect to "other gospels" of more current "minting," the Apostle John (the "apostle whom Jesus loved") wrote the following definitive declaration in the last book of canon of the New Testament, that CLOSED the apostolic "office" and the authority given by God to the them to write and establish the New Testament, as the writers of the Old Testament were also inspired BY God:
"I warn everyone who hears the words fo the prophecy of this book: If anyone adds anything to them, God will add to him the plagues described in thsi book. And if anyone takes words away from this book of prophecy, God will take away from him his share in the tree of life and in the holy city, which are described in this book. He (Jesus) who testifies to these things says, "Yes I am coming soon." Amen. Come Lord Jesus. The grace of the Lord Jesus be with God's people. Amen. (Rev.22:18-21, NIV)
With John's death, the apostolic "office" closed and the authority given to write and establish the New Covenant Scripture ended. There are no new "apostles" as that was an office specifically established by Jesus for the fulfillment of the commission He had given them.