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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...

others.” That is, Irenaeus implies that it is on the basis of Scripture that Scripture should be understood. Irenaeus states this principle formally in Against the Heresies: “the demonstrations (ostensiones) [of things contained] in the Scriptures cannot be demonstrated except from the Scriptures themselves.” (AH 3:12:9). If some passages of Scripture appear to us to be obscure, we should seek to understand them by what is clear and manifest in Scripture and not by any other extraneous reasoning
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