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The Church Fathers · 434
The Commonitory
Vincent of Lérins · d. c. 445
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What it is
How to tell catholic truth from novelty: hold what has been believed everywhere, always, and by everyone — with a careful account of how doctrine may nevertheless grow.
Why it lasted
The Vincentian canon, quoted in every subsequent argument about development of doctrine, by Newman above all.
Where to read it
Public domain and free to read in full, though not held here. The archives below have it.
These open a search on each archive rather than a direct link, which is the honest way to point at an edition nobody here has checked line by line.
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