The Bible was written over a period of 1500 years, with over 40 different writers from different walks of life.
The twelve Apostles, along with the Apostle Paul, received their teaching directly from the Lord Jesus Christ.
The primary standard applied to a New Testament book was that it was written by an Apostle or by someone close to the Apostles. The early church continued in the apostles' doctrine by reading the Scriptures (the whole letter written to them) and applying the truths of that letter (Acts 2:42). Apostolic writings carried ultimate authority and were the teachings of Jesus as understood by the Apostles (Acts 2:42; 1 Timothy 6:3‑4).

I personally adhere to the first-century church and what the early believers understood when they first heard a New Testament letter read to them. I personally do not believe that we should take Scriptures out of context (that which precedes and/or follows any part of a discourse). I personally do not adhere to a twentieth-century mystical interpretation that reads into the passage, doctrines that the early church did not know nor perceive.

The Apostle Paul told Timothy,
"The word for 'Scripture' in Greek is 'graphe.' In the New Testament this term is used exclusively of Scripture and is used in such a way that quoting Scripture (or reading) is understood to be the same as quoting God (See John 10:35; Romans 4:3; 9:17; Galatians 4:30)" (Expository Dictionary of Bible Words, page 544).

"The Scriptures were formally constituted into a 'canon' (a rule of measure that established them as being the true Word of God). The reading of them was, along with prayer, the chief part of the service of worship from the time of Ezra onwards. Indeed, it seems that the reading out of the law (the Word of God) gave the motivation [and pattern] for the first meetings for worship (in the New Testament church), where the word of God was heard. The first Christians were Jews among Jews." (Dictionary of New Testament Theology Vol. 3, pages 485, 493).

It was always the practice of God's people to have the Word of God read aloud in the congregation. This is true whether it was the Old Testament or the New Testament (Exodus 24:7; Deuteronomy 31:11; Joshua 8:35; 2 Kings 23:2; Nehemiah 8:7‑8; Luke 4:16; Acts 15:21; Colossians 4:16; 1 Thessalonians 5:27). In the book of Revelation it states,
There was also a warning that what was read, was not to be added to or taken away from (Revelation 22:18‑19). When the rich man that had died asked for someone to come back from the dead so that they might go to his brothers and warn them (lest they come to the place of torment that he was in), he was told,
Jesus said,
A "damnable heresy" (2 Peter 2:1) means "that which leads to spiritual ruin or destruction." "Heresy" means "to pick or to choose, a self-willed opinion" (See Strong's Greek Lexicon). If there are 40 Scriptures on two pages and you choose only 10 that you will acknowledge and believe, then you are already in "heresy." Do I become your enemy because I tell you the truth? (Galatians 4:16)