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On the Apostolic Preaching is unavailable, but you can change that!

St. Irenaeus, undisputedly the most important theologian of the second century, laid a firmer foundation for all future Christian thinkers. Both in his work, Against the Heresies and in this present study, Demonstration of the Apostolic Preaching, St. Irenaeus explains that there is but one God, made known to the human race by his one Son, Jesus Christ, through the one Holy Spirit; and this one...

Irenaeus is the first patristic writer to make full use of the apostolic writings as Scripture.5 He knows and uses practically the full range of New Testament texts that we now recognize, and, for the Gospels, insists that there can be neither more nor less than four, or rather, one Gospel in four forms.6 In his great work, Against the Heresies, after describing the systems of the Gnostics in book 1, and demonstrating their inconsistencies in book 2, Irenaeus turns, in books 3 to 5, to “the demonstration
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