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The Church Fathers · c. 363–373
Hymns Against Heresies
Ephrem the Syrian · c. 306–373
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What it is
Polemic set to popular tunes, answering the followers of Bardaisan, Marcion, and Mani in the same metres they used for their own hymns.
Why it lasted
The clearest evidence that early doctrinal disputes were fought out in song as much as in treatises.
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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