There is a reason why not all 'scripture' made it into the Bible Canon. Some have tried to include apocryphal and gnostic scriptures into the bible canon, but those books have never been viewed as part of the inspired record. So why do some books get included and some rejected as being inspired?
The meaning of 'canon' (Greek ka·non′
applies to a a tool for measuring in the scriptures. When applied to the books of the bible, it literally means the writings which can be used as a guide for what is true and inspired and worthy to be used as a straightedge in determining the right faith, doctrine, and conduct.
Any book claiming to be inspired of God should demonstrate this by what the book contains.
1. The document must deal with Jehovahs affairs in the earth. It should turn people to his worship and stimulating deep respect for his name and for his work and purposes in the earth.
2. It must give evidence of inspiration by holy spirit and demonstrate the holy attitudes of that spirit.
3. There must be no appeal to superstition or creature worship but, rather, an appeal to love and service of God.
4. There would have to be nothing in any of the individual writings that would conflict with the internal harmony of the whole, but, rather, each book must, by its unity with the others, support the one authorship, that of Jehovah God.
5. The writings should give evidence of accuracy (ie historical/geographic/timing/prophecy) down to the smallest details
For the reasons stated above, the apochryphal/gnostic writings were always excluded as part of the canon for the reason that they do not prove to be in harmony with this process. They often show contradictory teachings and ideas. For example, the Gospel of Judas paints him as a loyal and faithful disciple who was following through on Jesus request to turn him over to the chief priests. This obviously disagrees with the Gospels of Matthew Mark and Luke regarding Judas as the 'Betrayer'.
If anyone would like to discuss why they believe the apocryphal or gnostic writings should be included, please state your reasons and show how they adhere to the 5 points above. And if anyone would like to discuss the process of how the cannon was chosen in the first place, feel free.