The New Testament Scriptures consist of twenty-seven different books, written by nine different authors. Each book has some special characteristics corresponding with the mind of the writer and the circumstances under which it was written. Yet these books exhibit a manifest unity of purpose and doctrine. Under many differences of dialect and expression there is an internal unity such as we do not find in any secular literature, and this unity is due to inspiration. The whole collection of books is called the CANON of the New Testament. This Greek word "canon" originally meant a straight rod, such as could be used for {3} ruling or measuring, then it was employed to signify a rule or law, and finally it meant a list or catalogue. As applied to the New Testament, the word "canon" means the books which fit the Church's rule of faith, and which themselves become a rule that measures forgeries and finds them wanting. The Church set these genuine books apart as having their origin in inspiration which came from God. They were all either written by the apostles or by men who were trained by the apostles, and thus they contain a unique account of the sayings of the Lord Jesus and the teaching of those who received their commission from Him. They are therefore documents to which the Church can refer, as a final court of appeal, in all questions of faith and conduct. It was only by degrees that the Church realized the importance of placing all these twenty-seven books in the canon. This was finally done in the western Churches of Christendom in A.D. 382, by a Council held at Rome.[1] The disciples first endeavoured to collect the sayings of our Lord and the record of His life. Thus the four Gospels constitute the first layer of the New Testament canon. The canon of our four Gospels existed by A.D. 150, as is shown by Hermas and Justin Martyr. The next layer of the canon consists of the thirteen Epistles of St. Paul and the Acts. To these the Epistle to the Hebrews was generally attached in the east, though not in the west. This layer of the canon was universally recognized towards the close of the 2nd century, and perhaps some years earlier, for the books composing it were used and quoted throughout the 2nd century. The third layer of the canon gained its place more slowly. It consists of what are called the "Catholic Epistles," viz. those of St. James, St. Peter, St. John, and St. Jude, together with the Revelation or Apocalypse of St. John.