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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