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Why are the first seven ecumenical councils important to Eastern Orthodoxy?

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Jesus Christ: mosaic — Eastern Orthodoxy Jesus Christ, detail of the Deesis mosaic, from the Hagia Sophia in Istanbul, 12th century.

The first seven ecumenical councils are of foundational importance to Eastern Orthodoxy because they are viewed as the authoritative expressions of the original, apostolic faith. These councils serve as the primary benchmarks for doctrinal consistency, ensuring that the church remains in continuity with the common Christian tradition of the early centuries.1

The significance of these councils lies in their role as guardians of dogma, particularly regarding the identity of the Holy Trinity and the incarnation of Jesus Christ. By clarifying these core truths and excluding deviant or inadequate understandings—such as Arianism—the councils consolidated the faith "once delivered to the saints".23

In the Orthodox perspective, these councils are not merely legalistic bodies; their authority is confirmed through their reception by the entire body of the church. They represent a living experience of truth, providing a framework that guides theology, liturgy, and the ongoing life of the church.1