The Filioque: The Spirit Proceeds From the Father and the Son, Beliefs & Restrictions
Standing
Concerns Point in Dispute
Currently States The Eastern churches object both to the doctrine and to the unilateral alteration of a creed a council had settled, and the two objections are separable.
Filioque, Latin for and the Son, was added in the Western church to the Nicene Creed's clause on the procession of the Holy Spirit, so that the Creed states the Spirit proceeds eternally from the Father and the Son as from one principle; the addition spread through Spain and Gaul before Rome itself adopted it, and was defended at the Councils of Lyons and Florence as a clarification of the original meaning rather than a change to it. John Meyendorff's survey of Orthodox theology records that the Eastern churches object on two separable grounds: to the doctrine itself, on the theological ground that it compromises the Father's unique role as sole source within the Trinity, and independently to the unilateral manner of the addition, altering a creed a universal council had already settled without convening a comparable council to approve the change. The Eastern Catholic churches, though in full communion with Rome, generally recite the Creed without the clause, which is itself evidence that the dispute has not been theologically closed even within the Catholic communion. It remains open because it combines a substantive trinitarian question with a procedural one about ecumenical authority, and resolving one does not resolve the other.
Source Byzantine Theology: Historical Trends and Doctrinal Themes, John Meyendorff