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The Filioque

The Competing Claims

The Eastern Confession

The Holy Spirit proceeds from the Father alone — the Father being the sole principle (archē), the sole cause (aitia), the sole source (pēgē) of the divine life. The Son is begotten of the Father; the Spirit proceeds from the Father. These two relations of origin — begetting and proceeding — are the sole basis of personal distinction within the Godhead. The Father’s monarchy is not a matter of rank or authority but of causality: the Father is the one from whom the Son and Spirit derive their existence eternally.

The original Niceno-Constantinopolitan Creed (381) reads: “And [we believe] in the Holy Spirit, the Lord and Giver of Life, who proceeds from the Father, who with the Father and the Son together is worshipped and glorified.” The phrase ek tou Patros ekporeuomenon — “proceeding from the Father” — was defined by the Second Ecumenical Council and received by the entire Church, East and West.

The East charges that the Western addition of Filioque (“and the Son”) is:

Theologically erroneous — it undermines the Father’s monarchy by introducing a second principle of the Spirit’s procession, thereby confusing the personal properties and tending toward modalism (blurring the distinction between Father and Son as causes)
Canonically illegitimate — it altered an ecumenical creed without an ecumenical council. The Council of Ephesus (431), Canon 7, forbade adding to the Nicene faith. The West added the Filioque unilaterally.

Photius of Constantinople (c. 810-893) mounted the definitive Eastern polemic in his Mystagogy of the Holy Spirit. The Cappadocians grounded the Spirit’s distinctness in His proceeding from the Father alone — if the Spirit also proceeds from the Son, His personal property is confused with the Son’s relation to the Father.

The Western Confession

The Holy Spirit proceeds from the Father and the Son (Filioque) as from one principle. This does not compromise the Father’s monarchy but expresses the fact that the Father never acts apart from the Son — that the Spirit is the Spirit of the Son (Galatians 4:6) as well as the Spirit of the Father.

Augustine (De Trinitate 15.26.47): “The Holy Spirit proceeds principally from the Father, and by the Father’s timeless gift to the Son, from the Son also.” The Spirit proceeds from the Father through the Son — or equivalently, from the Father and the Son. The Father remains the principaliter — the principal source — but the Son’s role in the procession is real, not merely economic.

Thomas Aquinas (ST I, q.36, a.2): “The Holy Spirit proceeds from the Father and the Son… If the Son did not differ from the Father in some respect, the Spirit proceeding from the Father would not be distinguished from the Son.” The Filioque is, for Aquinas, necessary to preserve the distinction between Son and Spirit — without it, the Son and Spirit would have the same relation to the Father (both proceeding from Him), and the persons would collapse.

The Filioque entered the Creed at the Third Council of Toledo (589) in Spain, originally as an anti-Arian clarification (affirming the Son’s full divinity by insisting the Spirit proceeds from Him too). It spread through the Frankish church and was eventually adopted at Rome — though Rome itself was initially cautious. Pope Leo III (d. 816) affirmed the Filioque as doctrinally true but refused to insert it into the Creed. The insertion into the Roman liturgy came later, probably under Benedict VIII (1014).

Scriptural Warrant

For the Eastern position (from the Father):

“But when the Helper comes, whom I will send to you from the Father, the Spirit of truth, who proceeds from the Father, He will bear witness about Me” (John 15:26) — the verb ekporeuetai is used exclusively of the Father as the source of the Spirit’s procession
The same verb (ekporeuomai) is never predicated of the Son in relation to the Spirit anywhere in Scripture

For the Western position (from the Father and the Son):

“The Spirit of truth, whom I will send to you from the Father” (John 15:26) — the Son sends the Spirit
“When the Spirit of truth comes… He will take what is mine and declare it to you” (John 16:13-14) — the Spirit receives from the Son
“God has sent the Spirit of his Son into our hearts” (Galatians 4:6) — the Spirit is the Spirit of the Son
“He breathed on them and said to them, ‘Receive the Holy Spirit’” (John 20:22) — the Son bestows the Spirit
“The Spirit of Christ” (Romans 8:9; 1 Peter 1:11) — the Spirit belongs to the Son, not only to the Father

The exegetical crux: The East distinguishes between the eternal procession (ekporeusis — from the Father alone) and the temporal mission (pempsis — sending, which involves the Son). The West argues that the temporal mission reveals the eternal procession — that if the Son sends the Spirit in time, this reflects the Son’s role in the Spirit’s eternal origin. The East denies this inference: economic activity does not straightforwardly map onto immanent relations.

Historical Development

The Cappadocians (4th century): established the Father’s monarchy as the organizing principle of Trinitarian theology. The Son is begotten; the Spirit proceeds. Both from the Father alone.
Augustine (early 5th century): developed the Western alternative — the Spirit as the mutual love of Father and Son, proceeding from both as from one principle (De Trinitate 15.17.29).
Council of Constantinople (381): defined “who proceeds from the Father” in the Creed. No mention of the Son.
Council of Ephesus (431): Canon 7 forbade additions to the Nicene faith — later invoked by the East against the Filioque.
Third Council of Toledo (589): first inserted Filioque into the Creed, as an anti-Arian measure in Visigothic Spain.
Charlemagne’s theologians (late 8th-early 9th century): pressed Rome to adopt the Filioque. Pope Leo III affirmed the doctrine but refused to alter the Creed — famously inscribing the original Creed on silver shields at St. Peter’s.
Photian Schism (863-867): Photius of Constantinople made the Filioque a formal charge against Rome.
The Great Schism (1054): the Filioque was one of the primary theological charges (alongside papal claims and azymes) in the mutual excommunications.
Council of Florence (1439): attempted union formula — “the Holy Spirit proceeds from the Father and the Son as from one principle” — but the union was rejected by the Eastern churches.
Vatican clarification (1995): the Pontifical Council for Promoting Christian Unity published a document acknowledging that the original Creed reads “from the Father” and that the Filioque is a legitimate Western theological development, not a correction of the East.

The Precise Point of Incompatibility

The incompatibility is not merely verbal. Two claims are at stake:

Theological: Does the Son play a causal role in the eternal procession of the Spirit? The West says yes (as from one principle with the Father). The East says no (the Father alone is the cause; the Son’s role is economic, not immanent). These cannot both be true if “procession” means the same thing in both cases.
Canonical: Was the West entitled to add Filioque to the Creed without an ecumenical council? The East says no — the Creed is the property of the whole Church, and altering it unilaterally is an act of communion-breaking presumption. The West says the addition is a legitimate theological development that explicates what was already implicit.

The canonical question is in some ways deeper than the theological one. Even if the Filioque is theologically true, its unilateral insertion into the ecumenical Creed may have been canonically illegitimate — a point even some Western theologians (Congar, Bobrinskoy) have conceded.

Convergence Already Achieved

Klingenthal Memorandum (1979): A group of Eastern and Western theologians proposed that “the Spirit proceeds from the Father of the Son” (ek tou Patros tou Huiou) — from the Father who is the Father of the Son — as a possible bridge formula.
Vatican Clarification (1995): acknowledged that the original Creed should not be altered and that the Filioque is a Western theologoumenon, not a correction of the Eastern position. This was significant — Rome effectively conceded the canonical argument without conceding the theological one.
The “through the Son” formula: Many patristic and modern theologians on both sides accept that the Spirit proceeds from the Father through the Son (dia tou Huiou / per Filium) — a formula used by John of Damascus, Maximus the Confessor, and Gregory of Cyprus, which both sides can receive as legitimate. Whether “through the Son” is equivalent to “and from the Son” remains disputed.

What Reconciliation Would Require

From the West (Rome and Protestantism): The most significant step would be removing the Filioque from the Creed — restoring the original text of Constantinople 381 in liturgical use — while retaining the Filioque as a legitimate Western theological opinion (theologoumenon). This would concede the canonical point (the Creed should not have been altered unilaterally) without conceding the theological point (the Western theology of the Spirit’s procession through/from the Son may still be defensible). Some Western theologians have already called for this. The 1995 Vatican clarification moved in this direction without taking the final step.

This would cost the West a visible concession — liturgically removing a phrase that has been prayed for over a millennium. It would feel like capitulation. But it would be a return to the ecumenical Creed as defined by the council that defined it — and the Western theological conviction could be preserved in theological formulation without imposing it on the Creed.

From the East: A willingness to acknowledge that the Western Filioque, in its best Augustinian formulation (principaliter from the Father, and from the Son by the Father’s gift), is not Sabellian or modalist but a genuine if different approach to the same mystery. The East would not need to adopt the Filioque but would need to accept it as a tolerable Western theologoumenon rather than a heresy. The “through the Son” formula — already accepted by Maximus the Confessor — offers a patristic bridge.

This would cost the East the satisfaction of a clean victory — of the West admitting it was simply wrong. The East would need to accept that the West’s theology, while different, is not heterodox. This is harder than it sounds: a thousand years of polemic have made the Filioque a symbol of Western presumption, and accepting its theological legitimacy (while rejecting its creedal insertion) requires distinguishing between the two charges more carefully than Eastern polemicists have typically done.

The eschatological hope: The Filioque is, among all the faultlines, the one with the clearest path to resolution. The theological content is negotiable (the “through the Son” formula); the canonical point is increasingly conceded by the West; the remaining obstacle is institutional pride on both sides. If the Body cannot heal this wound — where the path is already visible — then the harder wounds (papacy, justification) have little hope.

For Further Study

Photius, Mystagogy of the Holy Spirit (c. 867) — the definitive Eastern polemic
Augustine, De Trinitate XV — the foundational Western theology
Pontifical Council for Promoting Christian Unity, “The Greek and Latin Traditions Regarding the Procession of the Holy Spirit” (1995) — the Vatican’s conciliatory clarification
A. Edward Siecienski, The Filioque: History of a Doctrinal Controversy (2010) — the best modern scholarly history
Maximus the Confessor, Letter to Marinus (c. 645) — the patristic bridge (accepting both “from” and “through” the Son)