The Filioque

The Story

The creed agreed at Constantinople in 381 says that the Holy Spirit “proceeds from the Father.” It does not say “and the Son.” Yet for most Western Christians today — Catholics, Lutherans, Anglicans, the Reformed — the line they recite reads “who proceeds from the Father and the Son.” That extra phrase is a single Latin word, Filioque, “and (from) the Son.” It is perhaps the most consequential word ever added to a Christian creed, and the East has never accepted it.

The clause seems to have entered the creed locally in Visigothic Spain. The Third Council of Toledo in 589 marked the conversion of King Reccared and his people from Arianism to Nicene Christianity, and the Spanish church recited the creed with Filioque as a way of stressing the full divinity of the Son against the Arians they were leaving behind. From Spain the usage spread through the Frankish church under Charlemagne, who pressed it energetically. Rome itself was slow and cautious: Pope Leo III in the early ninth century affirmed the doctrine but reportedly had the creed engraved in Greek and Latin without the clause, to protect the original text. Only later did the interpolated creed reach the Roman liturgy — by tradition at the imperial coronation of Henry II in 1014, under Pope Benedict VIII.

The East noticed. In the ninth century the patriarch Photius of Constantinople made the Filioque a central charge against the Frankish missions, arguing in his treatise on the Holy Spirit that the addition both corrupted an ecumenical creed and confused the relations within the Trinity. A council in Constantinople in 879–880, attended by papal legates, reaffirmed the creed without addition and forbade alterations. The dispute simmered for another century and a half.

In 1054 it boiled over. Legates of the recently deceased Pope Leo IX, led by Cardinal Humbert, laid a bull of excommunication on the altar of Hagia Sophia against Patriarch Michael Cerularius; the patriarch and his synod excommunicated the legates in return. Many causes lay behind the rupture — unleavened bread, papal authority, jurisdiction — but the Filioque was the foremost doctrinal grievance, and the year became the conventional date of the East–West Schism. Two later reunion councils, the Second Council of Lyon (1274) and the Council of Florence (1438–1439), secured Greek signatures defending the clause; both unions collapsed under rejection back home in the East. The word still divides the two largest bodies of Christians on earth.

Who Draws the Line

There is no ecumenical council that has condemned the doctrine that the Spirit proceeds from the Son, and no Western body has ever defined the Eastern view as heresy in the way the Council of Toledo’s Western creed implied otherwise. The line here is drawn from the Eastern side, and on a particular authority: the inviolability of the Niceno-Constantinopolitan Creed.

The Council of Constantinople in 879–880, recognized by the Eastern Orthodox as ecumenical, reaffirmed the creed of 381 and anathematized anyone who would compose another creed or add to or subtract from this one. Eastern theologians read this as a standing prohibition of the Filioque itself. Beyond the question of the word, many Eastern fathers — Photius most sharply — held the underlying teaching to be false: the Father alone is the single source (aitia, cause) of both the Son and the Spirit, and to make the Son a co-source of the Spirit subverts the Father’s unique role.

Rome’s own position has shifted over time. A 1995 clarification from the Pontifical Council for Promoting Christian Unity affirmed that the Father is the sole cause of the Spirit, and distinguished the Greek verb in the creed (ekporeuesthai, denoting origin from the ultimate cause) from the Latin procedere, which it said carries a broader sense. On that reading the two traditions may not actually contradict — a conclusion many Orthodox theologians accept and many others still dispute.

Why You Might Accidentally Believe This

If you grew up in almost any Western church, you simply recited it. The clause is woven into the Mass, the Book of Common Prayer, Lutheran and Reformed liturgies, and countless hymns. To most Western Christians “from the Father and the Son” is just what the creed says; the shorter form sounds like the deviation.

The intuition behind it is also natural. The New Testament repeatedly calls the Holy Spirit the “Spirit of Christ” and shows the risen Jesus sending the Spirit. If the Spirit belongs to the Son and is sent by him, it feels obvious that the Spirit must somehow come from him too. Augustine’s enormously influential teaching — that the Spirit is the bond of love between Father and Son and proceeds from both — gave this instinct a deep theological grounding for the entire Latin tradition.

The Strongest Case For This View

The Western case begins with the texts that tie the Spirit closely to the Son. Jesus says he will send the Paraclete (John 15:26; 16:7); the Spirit is called “the Spirit of his Son” (Galatians 4:6) and “the Spirit of Christ” (Romans 8:9); and in John 20:22 the risen Jesus breathes on the disciples and says “Receive the Holy Spirit.” If the Spirit is so intimately the Son’s, defenders argue, then the eternal relations must mirror this: the Spirit proceeds from the Father and the Son.

Augustine articulated the classic rationale in On the Trinity: the Spirit proceeds principally from the Father, but because the Father has given the Son everything he has — including the capacity to be a source of the Spirit — the Spirit proceeds from both as from one principle. Western defenders insist this does not create two sources; the Son receives even this from the Father, so the Father remains the ultimate origin. They also point out that respected Greek fathers used language of the Spirit proceeding “through the Son” (per Filium), which the Council of Florence treated as equivalent in meaning.

The doctrinal motive was protective, not aggressive. At Toledo the clause guarded the Son’s full divinity against Arianism: a Son who is truly God can be a source of the divine Spirit. For the Latin tradition, dropping the clause risks loosening the unbreakable bond between the second and third persons of the Trinity.

The Strongest Case Against

The Eastern objection comes on two levels. The first is canonical. Whatever the doctrine’s merits, no local synod and no patriarch had the authority to alter a creed promulgated by an ecumenical council for the whole Church. The West changed the universal symbol of faith unilaterally, without an ecumenical council, and then required the East to accept the change. For the Orthodox this is a breach of conciliar order regardless of the theology.

The second is the theology itself. Photius argued that the Father alone is the cause within the Trinity — the one fountainhead (monarchia) from whom both the Son (by generation) and the Spirit (by procession) derive. To make the Son a second source of the Spirit either introduces two principles into the Godhead or collapses the distinct properties that make the Father the Father. Later Byzantine theologians, including Gregory Palamas, sharpened the point: the Spirit proceeds eternally from the Father alone, even if the Spirit is sent in time through the Son. The Eastern view carefully distinguishes the eternal origin of the Spirit from the temporal mission — a distinction they say the Latin formula blurs.

The Orthodox also resist the claim that Filioque and per Filium simply mean the same thing. “Through the Son” can describe how the Spirit is manifested or sent; “and from the Son” makes a claim about the Spirit’s very origin. Reading the Greek fathers’ “through the Son” as the Latin “and the Son,” they argue, imposes a foreign meaning on them.

What the New Testament Actually Says

The decisive proof text for the East is John 15:26: the Spirit of truth “who proceeds from the Father” (Greek ekporeuetai, present tense). The verse names the Father as the one from whom the Spirit proceeds and is silent about the Son as a source of that procession — even though, in the very same sentence, Jesus says he himself will send the Spirit. Eastern readers take this as exactly the distinction they want: the Son sends, the Father is the origin.

The wider New Testament, however, does not settle the dogmatic question, because it is not asking it. Its language is overwhelmingly about the Spirit’s mission in salvation history — the Spirit poured out, sent, given, breathed — not about eternal relations of origin within the Godhead. Texts calling the Spirit the “Spirit of Christ” (Romans 8:9) or showing the Son sending the Spirit (John 16:7) can ground either reading: the West hears an eternal procession, the East hears a temporal sending. The vocabulary of “eternal procession” itself is a later theological refinement built atop, but not simply read out of, the scriptural data.

So the texts under-determine the dispute. John 15:26 supplies the one clear statement, and it says “from the Father.” Whether that excludes the Son, or merely declines to mention him, is the very point at issue — and the New Testament does not adjudicate it.

Further Reading

• A. Edward Siecienski, The Filioque: History of a Doctrinal Controversy (Oxford University Press, 2010) — the standard modern scholarly history.
• Photius, On the Mystagogy of the Holy Spirit (9th century; English translation, Studion Publishers, 1983).
• Augustine of Hippo, On the Trinity (De Trinitate, early 5th century), Books V and XV.
• Pontifical Council for Promoting Christian Unity, “The Greek and Latin Traditions Regarding the Procession of the Holy Spirit” (1995).
• John Meyendorff, Byzantine Theology: Historical Trends and Doctrinal Themes (Fordham University Press, 1974).
• Vladimir Lossky, The Mystical Theology of the Eastern Church (1944; English translation, James Clarke, 1957), chapter on the procession of the Holy Spirit.