I heard something like this as a young seminarian. The canon of the New Testament would be the twenty-seven books that made it into the Christian scripture, as a second part of the Christian Bible (along with the 39-book canon of the Old Testament). I suspect you’ve heard something similar. The New Testament is a collection of 27 books, usually placed after the Old Testament in most Christian Bibles. The name refers to the new covenant (or promise) between God and humanity through the death and resurrection of Jesus Christ. The fifth-century church councils finally settled the matter. Book 25 of 27 - THIRD LETTER OF JOHN. Where written: Ephesus. Other Gaius' in the New Testament are from Corinth (Romans 16:23, 1 Corinthians 1:14), from Macedonia (Acts 19:29); and from Derbe (Acts 20:4,5) The New Testament Canon (the authoritative collection of books) was formed over a period of sorting and sifting overseen by the Holy Spirit that was essentially completed by c. AD 200. The setting of the New Testament within the Christian community is one factor that makes a biography of Jesus or a history of the 1st-century church difficult or impossible. Date: c AD90-100. Reader: Gaius, a common Roman name. Writer: The apostle John, towards the end of his life. The New Testament is a collection of 27 smaller documents, called “books.” And while the Catholic, Protestant, and Orthodox branches of Christianity disagree on how many books should be included in the Old Testament, the New Testament books are the same across the board. The books of the New Testament were composed not in order to satisfy historical curiosity about the events they recount but to bear witness to a faith in the action of God through these events.