The Filioque: Why One Phrase Helped Divide East and West
Every Sunday, Christians across the world confess faith in the Holy Spirit.
The Nicene-Constantinopolitan Creed, in the form associated with the Council of Constantinople in AD 381, says that the Holy Spirit “proceeds from the Father.”
In the medieval Latin West, another phrase became standard:
“who proceeds from the Father and the Son”
The Latin words are Filioque—“and from the Son.”
That small addition became one of the most famous disputes between Roman Catholicism and Eastern Orthodoxy.
But the controversy is not really about one word.
It concerns two questions:
- What is the eternal relationship of the Holy Spirit to the Father and the Son?
- Did the Western Church have authority to alter the text of an ecumenically received creed?
Those questions must be kept distinct.
What the Original Creed Says
The creed associated with the First Council of Constantinople confesses the Holy Spirit as:
“the Lord, the giver of life, who proceeds from the Father.”
This language reflects John 15:26, where Jesus says that the Spirit of truth “proceeds from the Father.”
The original Greek text does not include “and the Son.”
That historical point is undisputed.
The filioque was added gradually in parts of the Latin-speaking West. It did not originate at Nicaea in 325 or Constantinople in 381.
Why Did the West Add It?
The phrase appears in the context of Western struggles against Arian and post-Arian theology, especially in Spain.
The Third Council of Toledo in 589 is commonly associated with its important liturgical and doctrinal use in the Latin West.
The goal was not to diminish the Holy Spirit or create two gods as sources of the Spirit. The phrase helped emphasize the Son’s full equality with the Father.
If the Spirit is eternally related not only to the Father but also to the Son, the Son cannot be a creature standing outside the divine life.
Over time the phrase spread through Frankish territories.
Rome itself was initially more conservative about changing the text of the Creed. The addition did not enter the Roman liturgical recitation of the Creed until the early eleventh century.
That fact alone shows why the controversy cannot be reduced to “the Orthodox removed words Catholics had always confessed.”
Historically, the addition occurred in the West.
Augustine and the Latin Tradition
Western theology was deeply shaped by St. Augustine of Hippo.
Augustine described the Holy Spirit in relation to both the Father and the Son and could speak of the Spirit proceeding from both.
Yet Augustine did not teach two independent causes within the Trinity.
For Latin theology, the Father and Son possess one divine essence, and the Spirit proceeds from the Father and the Son in a manner that preserves the Father as the primordial source.
Later Catholic theology would refine this language carefully.
This is important because Orthodox criticism should engage the strongest Catholic formulation, not the caricature that Catholics believe the Spirit has “two Fathers.”
They do not.
The Eastern Concern: The Monarchy of the Father
Greek patristic theology often emphasizes the monarchy of the Father.
The Father is the personal source (arche, aitia) within the Trinity. The Son is eternally begotten from the Father. The Holy Spirit eternally proceeds from the Father.
The divine persons are not distinguished by possessing portions of the divine essence but by their irreducible relations of origin.
From this perspective, saying that the Spirit eternally proceeds “from the Father and the Son” can sound as though the Son shares the Father’s personal property of being cause.
That is why the dispute is more serious than vocabulary.
Orthodox theology fears that the filioque, if understood causally, confuses the personal properties of Father and Son.
“Through the Son” Is Important
Eastern Fathers do not normally describe the Son as irrelevant to the Spirit’s eternal existence.
The phrase “through the Son” has deep patristic roots.
St. Cyril of Alexandria, for example, uses strong language relating the Spirit to the Son. Other Eastern Fathers speak of the Spirit resting in, shining through, or being eternally manifested through the Son.
This has created space for modern dialogue.
Can the West’s Filioque be understood in a way compatible with the Eastern confession that the Father alone is the ultimate cause?
Catholic theology has increasingly said yes.
The Catholic Catechism explicitly teaches that the Western tradition does not make the Father and Son two independent principles of the Spirit.
Maximus the Confessor: A Key Bridge
St. Maximus the Confessor is one of the most important witnesses in the entire controversy.
In the seventh century, Maximus defended Latin Christians against accusations that their language made the Son a second cause of the Spirit.
He explained that the Romans did not mean that the Son is the cause of the Spirit in the same sense as the Father. Rather, the Father remains the one cause, while the Latin expression intends to confess the Spirit’s eternal relation through the Son.
This text is enormously important for ecumenical discussion.
It shows that at least one major Greek Father believed a Latin formulation involving the Son could be interpreted orthodoxly.
But it does not solve every later controversy, because medieval Western definitions sometimes employed terminology that Greeks found much harder to reconcile with the monarchy of the Father.
Florence and “One Principle”
At the Council of Florence in 1439, the attempted reunion of East and West produced a formal agreement on the filioque.
The decree taught that the Holy Spirit is eternally from the Father and the Son, and that Father and Son are “one principle” of the Spirit.
The council also accepted that “through the Son” could express the same truth under an appropriate understanding.
Catholics regard Florence as an ecumenical council.
The Orthodox Church ultimately rejected the union.
Many Orthodox objected not merely to the vocabulary but to the theological implications of describing Father and Son together as one principle of the Spirit’s hypostatic procession.
The Second Problem: Who Can Change the Creed?
Even if a completely Orthodox theological meaning can be attached to the Latin formula, another problem remains.
The Creed was the common confession of the ecumenical Church.
The West gradually inserted the filioque into that creed without an ecumenical council shared by East and West.
For Orthodoxy, this is a major ecclesiological problem.
The issue is not simply whether the added words can be interpreted charitably. It is whether one regional church—or eventually the Roman see—could modify a creed received by the whole Church.
This dispute therefore links the doctrine of the Trinity to the doctrine of Church authority.
Did Ephesus Forbid All Later Creedal Language?
Sometimes Orthodox polemics say the Council of Ephesus absolutely prohibited adding even a word to the Creed.
That requires nuance.
Ephesus condemned the production of a rival faith that displaced the Nicene faith, particularly in a contentious Christological setting. The Church itself later received the expanded creed associated with Constantinople.
So the canonical issue is more complicated than “no word could ever be added after 431.”
Nevertheless, the East’s broader objection remains powerful: a universally received symbol of faith should not be unilaterally altered by one part of the Church.
Catholic Clarifications in Modern Dialogue
Modern Catholic statements have moved closer to the patristic Eastern concern than popular polemics often suggest.
Catholic theology can affirm:
- the Father as the first origin and source within the Trinity;
- that the Spirit does not proceed from two separate principles;
- the legitimacy of the Eastern formula “from the Father through the Son”;
- the original Greek form of the Creed without the filioque.
Indeed, Eastern Catholic churches commonly recite the Creed without the addition.
This demonstrates that communion with Rome does not require every Catholic liturgical tradition to pronounce the Latin interpolation.
Is the Dispute Merely Verbal Today?
Not entirely.
A great deal of the disagreement can be reduced by distinguishing Greek and Latin theological vocabulary. The Greek verb ekporeuesthai has a more specific sense of origination than the Latin procedere. A Latin Christian could therefore say procedit a Patre Filioque while intending something less problematic than a Greek Christian might hear in an exact Greek rendering.
But theological and ecclesiological differences remain.
Orthodox theology normally insists that the Father alone is the personal cause of both Son and Spirit. Catholic theology permits formulations in which the Spirit is said to proceed eternally from the Father and the Son as from one principle, while denying two causes.
Whether those formulations are ultimately equivalent remains disputed.
Final Verdict
*The filioque was not part of the original Nicene-Constantinopolitan Creed. It arose gradually in the Latin West and was later inserted into Rome’s liturgical use of the Creed.*
Its theological intention was not Arian, tritheistic, or anti-Spirit. Catholic theology explicitly rejects the idea of two independent sources of the Holy Spirit.
And Eastern theology itself contains strong language about the Spirit’s eternal relation to the Son, especially the formula “through the Son.”
Nevertheless, the Orthodox objections cannot be dismissed as a quarrel over semantics.
There are two substantive issues:
- Theological: Does the Western formula sufficiently preserve the Father’s unique monarchy as the personal cause in the Trinity?
- Ecclesiological: By what authority was a universally received creed altered in one part of the Church?
Modern dialogue has narrowed the first disagreement considerably.
The second leads directly back to the unresolved question of papal and conciliar authority.
That is why the filioque remains a symbol of the larger Catholic–Orthodox divide: one phrase where Trinitarian theology, language, history, and ecclesiology all meet.
Key Sources
Primary and official sources
- John 14:26; 15:26; 16:13–15.
- Nicene-Constantinopolitan Creed.
- Augustine, De Trinitate.
- Cyril of Alexandria, Trinitarian and Christological writings.
- Maximus the Confessor, Letter to Marinus.
- Council of Florence, Laetentur Caeli (1439).
- Catechism of the Catholic Church, §§243–248.
- Pontifical Council for Promoting Christian Unity, The Greek and Latin Traditions Regarding the Procession of the Holy Spirit (1995).
Modern scholarship
- A. Edward Siecienski, The Filioque: History of a Doctrinal Controversy.
- John Meyendorff, Byzantine Theology.
- Yves Congar, I Believe in the Holy Spirit.
- Boris Bobrinskoy, The Mystery of the Trinity.