Marcion, the Gnostic, was the enemy of all Judaism, and regarded the God of the O. T. as a restricted divinity, entirely different from the God of the N. T. Marcion was “ipso Paulo paulinior”—“plus loyal que le roi.” He held that Christianity was something entirely new, and that it stood in opposition to all that went before it. His Canon consisted of two parts: the “Gospel” (Luke, with its text curtailed by omission of the Hebraistic elements) and the Apostolicon (the epistles of Paul). The epistle to Diognetus by an unknown author, and the epistle of Barnabas, shared the view of Marcion. The name of the Deity was changed from Jehovah to Father, Son, and Holy Ghost. If Marcion’s view had prevailed, the Old Testament would have been lost to the Christian Church. God’s revelation would have been deprived of its proof from prophecy. Development from the past, and divine conduct of Jewish history, would have been denied. But without the Old Testament, as H. W. Beecher maintained, the New Testament would lack background; our chief source of knowledge with regard to God’s natural attributes of power, wisdom, and truth would be removed: the love and mercy revealed in the New Testament would seem characteristics of a weak being, who could not enforce law or inspire respect. A tree has as much breadth below ground as there is above; so the O. T. roots of God’s revelation are as extensive and necessary as are its N. T. trunk and branches and leaves. See Allen, Religious Progress, 81; Westcott, Hist. N. T. Canon, and art.: Canon, in Smith’s Bible Dictionary. Also Reuss, History of Canon; Mitchell, Critical Handbook, part I. B. The Christian and Apostolic Fathers who lived in the first half of the second century not only quote from these books and allude to them, but testify that they were written by the apostles themselves. We are therefore compelled to refer their origin still further back, namely, to the first century, when the apostles lived. (_a_) Irenæus (120-200) mentions and quotes the four gospels by name, and among them the gospel according to John: “Afterwards John, the disciple of the Lord, who also leaned upon his breast, he likewise published a gospel, while he dwelt in Ephesus in Asia.” And Irenæus was the disciple and friend of Polycarp (80-166), who was himself a personal acquaintance of the Apostle John. The testimony of Irenæus is virtually the evidence of Polycarp, the contemporary and friend of the Apostle, that each of the gospels was written by the person whose name it bears.