I would suggest that that is impossible to define.
As in the past, we choose what ever meets our criterion and expectations.
It is said that the new testament bible books were chosen as to their authorship connection to the Apostles.
However it has since be shown that none of them have a proven connection and most if not all were written by others.
All the actual Authors were men. and all the selectors were men. neither God nor Jesus were involved in the writing or choices. Some books like Revelation have been both in and out of the canon.
And not all churches subscribe to the same canon or number of books.
There has never been a consistent way to define or choose "Holy Writings"
Have you ever noticed that, while reading the bible, the writer often makes references to other bible books or quotes verses from other books?
If you've noticed that, then one thing you might consider is why those writers never quote from apocryphal sources. There is something to be said about that.
I think we need to trust that the 12 apostles, whom Jesus assigned, were capable of ensuring inspired writings became the basis for the new Christian congregations. Those writings were the 4 gospels, the letters of Paul, Acts and the smaller books written by those who were from among that group such as James and Jude etc.
Jesus gave these men instructions and holy spirit. Those books of the 'original' canon are all we need because they were holy spirit inspired. Apocryphal books are nothing except interesting from an historical perspective but i really dont think they can be classed in with the original christian scriptures.