"All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness,"- 2 Timothy 3:16
We all know the Bible is a collection of texts and was not physically written by a single person, prophet, messenger, apostle, or whatever you want to call them.
Timothy being one of the many texts makes quite a general statement that "All Scripture is God-breathed".
How do we know what "Scripture" the author of Timothy is referring to?
For the purpose of this question I am not trying to open the door for other religious texts outside Christianity (Qur'an, Vedas, etc.). What I am more getting at is how Catholics have more texts in their Bibles (Texts referred to as 'Apocrypha'), while other Christians will not include these texts in their Bibles. So there is a fundamental disagreement on what should be included and what is "God-breathed". In addition to this there are Scriptures referred to in the current Bible that are not a part of it. Lost? Renamed? Something else?
In order to judge what would qualify we need a list of criterion. Does the Bible include such? Where?
We believe all Scripture is not by men, but by the Holy Spirit.
2 Peter 1:20-21 (New International Version)
20Above all, you must understand that no prophecy of Scripture came about by the prophet's own interpretation. 21For prophecy never had its origin in the will of man, but men spoke from God as they were carried along by the Holy Spirit.
There are some books of the Bible which not all include.
We go by the Holy Spirit. The same Spirit which moved the authors of the Bible. 'The Holy Spirit brings to mind scripture'.
As for why there are minor disagreements on what books to include, it should be noted: these are very minor books. It is not a fundamental disagreement. Sometimes these books are looked at and consulted by various denominations.
It is definitely not so fundamental so as to go to something of a dramatically different "flavor" as the Vedas or the Koran.
Christians have been writing for two thousand years: some are more metaphoric, some are less. Some are more pure, some less pure. There are many popular books by Christians where there is much put in there by the Holy Spirit.
The Bible, however, is different, it is purely as the prophets and apostles were moved by the Holy Spirit.
As for scriptures that are "lost", that is debatable, and largely people making assumptions. For instance, in Jude one sees a line about the Devil arguing over the Body of Moses and some say this may have come from a book which was written about in some places called the "Assumption of Moses". It may have. It may not have.
Also there are some quotes which are thought to be a part of a lost book of Enoch. (Some have said this has since been found.) We do not know that for sure.
People forget that Jesus was with the Apostles for several years. Further, there were many prophets during that time. Not everything of interest was recorded.
People forget Enoch's journey was not recorded by man, nor Noah, nor Lot, nor Abraham. These people did not have scribes following them around. God told their stories to Moses in the tent and Moses wrote them down as God dictated to him.
Otherwise, see my signature... 'we do not need teachers, for we have the anointing'.
While we are not believed: 'that anointing is real' and 'we know it is real'.
1 John
18Dear children, this is the last hour; and as you have heard that the antichrist is coming, even now many antichrists have come. This is how we know it is the last hour. 19They went out from us, but they did not really belong to us. For if they had belonged to us, they would have remained with us; but their going showed that none of them belonged to us. 20But you have an anointing from the Holy One, and all of you know the truth.[
d]
21I do not write to you because you do not know the truth, but because you do know it and because no lie comes from the truth. 22Who is the liar? It is the man who denies that Jesus is the Christ. Such a man is the antichrist—he denies the Father and the Son. 23No one who denies the Son has the Father; whoever acknowledges the Son has the Father also.
24See that what you have heard from the beginning remains in you. If it does, you also will remain in the Son and in the Father. 25And this is what he promised us—even eternal life.
26I am writing these things to you about those who are trying to lead you astray. 2
7As for you, the anointing you received from him remains in you, and you do not need anyone to teach you. But as his anointing teaches you about all things and as that anointing is real, not counterfeit—just as it has taught you, remain in him.
The Kingdom of Heaven is among men, but 'does not come with careful observation' so they see it.
This is because the 'Kingdom of Heaven is in the heart'.
Luke 21
20Once, having been asked by the Pharisees when the kingdom of God would come, Jesus replied, "The kingdom of God does not come with your careful observation, 21nor will people say, 'Here it is,' or 'There it is,' because the kingdom of God is within[
b] you."
The
is "among you" and both meanings are true.
We are simply not of this world and decide by our own hidden counsel what is of God and what is not of God.