The description of the ''filioque'' as a heresy was iterated most clearly and definitively by the great [[Church Fathers|Father]] and [[Pillars of Orthodoxy|Pillar]] of the Church, St. [[Photius the Great]], in his ''On the Mystagogy of the Holy Spirit''. He describes it as a heresy of [[Triadology]], striking at the very heart of what the Church believes about God.
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