What Is the Filioque?
The Filioque (Latin for 'and the Son') is a phrase added to the Nicene Creed by the Western Church. The original Creed (381) states that the Holy Spirit 'proceeds from the Father.' The Western addition says He proceeds 'from the Father and the Son.' This seemingly small change became a major point of contention between East and West, contributing to the Great Schism of 1054.
How the Addition Happened
The Filioque first appeared in Spain in the sixth century, possibly to combat Arianism by emphasizing Christ's divinity. It spread through the Frankish Church and eventually to Rome, which adopted it into the Creed around 1014. The Eastern Church objected both to the content and to the unilateral manner of its addition—without an Ecumenical Council's approval.
The Orthodox Objection
Orthodox Christians have two main concerns. First, procedural: the Nicene Creed was defined by Ecumenical Councils and should not be altered without another council's consent. The West changed the common creed of Christendom on its own authority. Second, theological: the Filioque appears to compromise the Father's unique role as the sole source (arche, aitia) of divinity within the Trinity.
The Father as Sole Source
Eastern theology emphasizes that the Father alone is the unbegotten source of the Son and the Spirit. The Son is eternally begotten of the Father; the Spirit eternally proceeds from the Father. If the Spirit also proceeds from the Son, it can seem that there are two sources in the Trinity, blurring the Father's distinctive hypostatic property. Orthodox theology guards the monarchy (sole rule) of the Father.
A Western Perspective
Western theologians often clarify that the Filioque does not mean two separate sources but one procession from the Father through or with the Son—the Spirit proceeds from the Father principaliter (principally) and from the Son as a secondary, dependent cause. Some Western theologians have expressed willingness to return to the original Creed or to interpret the Filioque in ways compatible with Eastern theology.
Ecumenical Dialogue
Modern Catholic-Orthodox dialogue has addressed the Filioque charitably. Both sides recognize that the different formulations may express complementary truths: the West emphasizing the Spirit's intimate relationship to the Son, the East guarding the Father's unique causality. The 1995 Vatican document 'The Father as Source of the Whole Trinity' acknowledged the legitimacy of the original Creed and the importance of the Eastern concerns.
What Is at Stake
The Filioque is not a trivial quarrel over words. Our understanding of God shapes everything else. If the Spirit proceeds from the Son as well as the Father, this affects how we understand Christ, the Church, and even authority structures. The Orthodox concern is to preserve the ancient faith without addition or subtraction—even when the addition seems pious.
The Way Forward
Many hope that a future council could address the Filioque and restore the original Creed across Christendom. Until then, the Orthodox Church continues to confess the Creed as received from the Second Ecumenical Council. This is not anti-Western prejudice but fidelity to what the whole Church once confessed together.