Psalterium decem chordarum

work by Joachim of Fiore

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In Joachim Of Fiore
His third main work, the Psalterium decem chordarum (“Psaltery of Ten Strings”), expounds his doctrine of the Trinity through the symbol of his vision of the 10-stringed psaltery. Here and in a lost tract he attacked the doctrine of “quaternity” (an overemphasis on the “one essence” of the Godhead that…
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