Irenaeus was a living link to the apostles. Although he became bishop of Lyons, in France, he was originally from the East. He was probably born in Asia Minor (modern day Turkey) around A.D. 130-140. As a youth he had seen and heard Polycarp of Smyrna, who, as Irenaeus put it, had received the things concerning the Lord from "the eyewitnesses of the Word of Life" (the name of John the disciple is often mentioned as one of these).

Irenaeus used these reports of Jesus, given "according to the Scriptures," delivered in the beginning by the apostles, to defend the truth of Christianity against a bewildering variety of early anti-Christian and heretical groups. As he did so, he gave the church a clear vision of the scriptural framework of its faith.

At the heart of this vision was Irenaeus's teaching of the right use of both the New Testament and the Old. Before Irenaeus, there was no New Testament. He is the first Christian writer to use, as Scripture, almost all the books that are in our New ...

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