One God in Trinity, and Trinity in Unity

The Text

This is the thesis of the entire creed. Everything in verses 4–28 is the unpacking of this one sentence, and everything in verses 29–43 is its Christological counterpart. Having told us in verses 1–2 that the catholic faith is the condition of salvation, the creed now tells us what the catholic faith is — and it does so with a verb that almost every reader misses.

It does not say that we believe one God in Trinity. It says that we worship — ut … veneremur — one God in Trinity, and Trinity in Unity. The most precise, most metaphysical, most forbidding of the catholic creeds defines the catholic faith as an act of worship, not as the holding of a correct opinion. The doctrine of the Trinity, in the very document most responsible for its reputation as a logic puzzle, is presented as the grammar of adoration. That single word, veneremur, is the hinge on which a faithful reading of the whole creed turns: the Trinity is not a problem the creed asks you to solve before you may be saved; it is the God the creed asks you to worship.

The formula itself is a chiasmus — one God in Trinity, and Trinity in Unity — and the crossing is the point. Read one way it guards monotheism (the Trinity is one God); read the other it guards the distinctions (the one God is the Trinity, not a solitary monad). The whole subsequent labor of the creed is to keep both readings true at once: to say triune without ever saying three gods, and to say one without ever collapsing the Three.

Translation Notes

Fides autem catholica haec est — “Now the catholic faith is this.” The connective autem turns the page from the warning to the content: you have been told the stakes; here is the substance. The demonstrative haec est — “this is it” — introduces a definition, and the creed is about to define the faith by an act, not a list.

ut … veneremur — “that we worship.” The verb governs the whole clause and it is not a verb of cognition. Veneror is the language of the cult: to venerate, to revere, to render the worship due to God. The creed could have written credamus (“that we believe”) and did not. The catholic faith, on the Athanasian Creed’s own definition, is the right worship of the right God — orthodoxia in its older and stronger sense, not “correct opinion” but “right glory,” right praise. Every later verse’s metaphysical precision exists to protect this act of worship from being offered to a God who is not there.

unum Deum in Trinitate, et Trinitatem in unitate — “one God in Trinity, and Trinity in Unity.” The chiastic balance is exact and untranslatable without loss: unum Deum … in Trinitate :: Trinitatem … in unitate. English keeps the words but flattens the music. The two phrases are not two doctrines (monotheism plus a doctrine of three) but one doctrine viewed from its two sides. The 1662 capitalization — Trinity, Unity — treats both as proper realities; the 1979 lower-cases unity and loses a little of the formula’s weight.

Trinitas — the word and the thing. Trinitas is a Latin coinage, first attested in Tertullian’s Adversus Praxean (c. 213), where he also gives the West una substantia, tres personae. The word is therefore about a century younger than the New Testament and is, strictly, the church’s term, not Scripture’s. This is not a concession that weakens the doctrine; it is the precise point Calvin will press against the anti-trinitarians (see below). The creed uses the church’s vocabulary deliberately, because Scripture’s own language, left unsystematized, had proved unable to exclude Arius.

Historical Context

By the year 500, when this creed was most likely composed in southern Gaul, the Trinitarian settlement was three centuries in the making and roughly two centuries old in its decisive form. The verse is a catechetical crystallization of that settlement, and behind its fourteen Latin words stand four developments.

Tertullian’s grammar (c. 213). The Latin West received its Trinitarian vocabulary from Tertullian’s Adversus Praxean, written against a modalist (Praxeas) who held that the Father himself suffered on the cross. Tertullian forged trinitas, persona, and substantia to say that Father, Son, and Spirit are one substance in three persons — tres … unius substantiae et unius status et unius potestatis. The Athanasian Creed’s unum Deum in Trinitate is Tertullian’s grammar, three centuries downstream.

The Cappadocian and Nicene resolution (325–381). The Greek East fought the long Arian war and reached the formula one ousia, three hypostases — the conceptual instrument by which the church could confess the Son and the Spirit as fully God without dividing the Godhead. The Athanasian Creed presupposes this entire settlement (see the annotation on the Nicene Creed’s of one Being with the Father) and states its result without rehearsing its history.

Augustine’s De Trinitate (c. 400–420). The Western form the creed actually distills is Augustine’s. Augustine begins from the unity of the divine essence and articulates the distinction of persons as subsistent relations — the Father is Father in relation to the Son, the Son Son in relation to the Father, the Spirit the bond of their love — and develops the famous psychological analogies (memory, understanding, will; lover, beloved, love). The Athanasian Creed is, in large part, Augustine made memorizable.

The liturgical home. The creed entered the Western Office and was sung at Prime. Veneremur is therefore not a metaphor: the verse was recited as worship, inside the daily prayer of the church, alongside the psalms and the Gloria Patri. The formula’s native habitat is the choir stall, not the lecture hall — a fact the later controversy over the warning clauses tended to obscure.

Lines of Interpretation

Every catholic tradition affirms this verse’s doctrine. The disputed question is not whether the one God is triune but how the formula should be ordered and understood — and, sharper, whether the Western “one God, then the Three” tilts the doctrine toward an abstract monotheism that the Trinity is meant to overcome.

Patristic

Tradition: Tertullian, Adversus Praxean; Augustine, On the Trinity; the Cappadocians (Basil, the two Gregories)

The patristic reading holds the chiasmus taut: against modalism (Praxeas, Sabellius), the persons are really distinct; against Arianism, the Godhead is really one. Augustine’s relational account is the West’s mature form; the Cappadocian ousia/hypostasis settlement is the East’s. Both refuse to let either monotheism or triunity swallow the other.

Strengths

• Holds radical monotheism and real triunity in a single confession, exactly as the chiastic formula demands
• Roots the doctrine in worship and Scripture (the baptismal Name, the apostolic benediction) rather than in speculation
• Supplies the conceptual tools (relation, person, substance) that make the formula sayable without contradiction

Weaknesses

• The bare formula, detached from the patristic argument, can be recited as arithmetic mysticism — “three is one” — which is precisely the misunderstanding it was built to prevent
• The Augustinian psychological analogies, powerful in his hands, degrade easily into illustrations that domesticate the mystery

Scholastic

Tradition: Anselm; Peter Lombard, Sentences I; Thomas Aquinas, Summa Theologiae I qq. 27–43

The Schoolmen received the formula and unfolded it with maximal rigor: one divine essence, absolutely simple; three subsistent relations (paternity, filiation, procession) really distinct from one another by relative opposition but not from the essence. Trinitas in unitate becomes: the one essence subsisting in three relationally constituted persons, with no composition and no division.

Strengths

• Preserves divine simplicity while securing the real distinction of persons — the most precise statement the doctrine has received
• Shows the formula is not a contradiction but a coherent account of relation within a single essence

Weaknesses

• The technical apparatus (relations of opposition, notional acts) stands at a great distance from the worshipper the verse’s veneremur has in view
• Tends, in lesser hands, to convert a doxological confession into a metaphysics seminar — the very inversion this verse’s main verb resists

Lutheran

Tradition: the Book of Concord (1580); the Augsburg Confession I

The Lutheran confessions receive the Athanasian formula verbatim and place the creed among the three ecumenical symbols. The Reformation did not relitigate the Trinity; it inherited and defended it. Unum Deum in Trinitate is, for the Augsburg Confession, simply the doctrine of God, asserted “without any doubt” against the ancient and the contemporary anti-trinitarians.

Strengths

• Demonstrates the Reformation’s deliberate continuity with the catholic dogma — the doctrine of God is not a Protestant innovation or revision
• Keeps the formula confessional and churchly, tied to the proclamation of the gospel rather than to scholastic system

Weaknesses

• The reception is doctrinal more than catechetical; the formula is affirmed more often than it is taught, and the gap shows in the pew
• Confessional confidence can leave the formula’s deep grammar unexplored, held as a boundary rather than opened as a treasure

Reformed

Tradition: Calvin, Institutes I.13; the Belgic Confession Arts. 8–9; the anti-trinitarian crisis (Servetus, the Socinians)

Calvin’s treatment is the classic defense of the verse’s vocabulary. The sixteenth-century anti-trinitarians (Servetus, then the Socinians) objected that Trinity, person, and substance are not biblical words. Calvin’s answer is the permanent Reformed contribution: the words are not in Scripture but the reality is, and the church may — must — coin terms to confess what Scripture teaches and to exclude what Scripture forbids. “If they call it a foreign term, because it cannot be pointed out in Scripture in so many syllables… [they] demand such moderation as to allow nothing to be said of the matter but what is in Scripture, syllable for syllable.” A faith that may use only Scripture’s own syllables cannot answer Arius — which is exactly why the Athanasian Creed exists.

Strengths

• The decisive defense of extra-biblical conciliar vocabulary as legitimate and necessary — directly underwriting the creed’s own Trinitas
• Holds the formula tightly to exegesis, refusing both biblicist minimalism and speculative excess

Weaknesses

• Reformed scholasticism after Calvin sometimes pressed the formula into refinements beyond the New Testament’s warrant
• A strand of later Reformed piety, wary of “speculation,” quietly under-uses the doctrine in practice, leaving it formally affirmed and devotionally inert

Eastern Orthodox

Tradition: the Cappadocians and John of Damascus as foundational; the modern Orthodox critique of the “Latin” model (Lossky, Zizioulas)

The East confesses this verse’s doctrine and does not receive this creed. On the formula itself, the characteristic Eastern emphasis reverses the Western order of exposition: the East “begins from the persons” — the Father as monarchia, the unoriginate source from whom the Son is begotten and the Spirit proceeds — and articulates the divine unity as the communion of the three, not as a prior, impersonal essence. Some modern Orthodox theologians (following the influential, and now much-criticized, contrast drawn by Théodore de Régnon) charge that the Western unum Deum in Trinitate, by starting from the one God, tilts toward an abstract monotheism in which the persons become secondary.

Strengths

• Keeps the persons concrete and the Father’s monarchy in view, guarding against a depersonalized “God in general” behind the Three
• Binds the doctrine to salvation as communion (theosis): we are saved into the life the Three eternally share

Weaknesses

• The East–West contrast, as De Régnon framed it, has been substantially overdrawn; recent scholarship (Ayres, Barnes) shows both traditions hold both the unity and the distinctions, and the neat “Latin essence-first / Greek person-first” schema is more historiographical artifact than fact
• The “monarchy of the Father,” pressed too hard, courts the very subordinationism the Athanasian formula’s later verses (none is afore or after; none is greater or less) explicitly foreclose

Modern / Ecumenical

Tradition: Karl Rahner, The Trinity; Karl Barth, Church Dogmatics I/1; Jürgen Moltmann, The Trinity and the Kingdom; the social-trinitarian debate

Rahner’s diagnosis is the modern starting point: most Western Christians are, in practice, “mere monotheists,” who could drop the Trinity and scarcely notice. The formula is recited and inoperative. Rahner’s cure is the Grundaxiom — the economic Trinity is the immanent Trinity — anchoring the doctrine in the history of salvation rather than in speculation. Barth grounds it in revelation; Moltmann and the social trinitarians press the communion of persons against the “Latin” model, sometimes to the edge of three centers of consciousness.

Strengths

• Names the real pastoral failure precisely: a formula confessed without effect on prayer, ethics, or imagination
• Reconnects the doctrine to the gospel and to lived worship — recovering, in effect, the verse’s own veneremur

Weaknesses

• Social trinitarianism can over-correct into a functional tritheism, which is exactly what unum Deum exists to forbid
• The modern recovery is often more academic than parochial; the gap between the seminary’s renewed Trinity and the pew’s vague monotheism remains the unsolved problem

Wesleyan Voice

Wesley’s clearest word on this verse’s doctrine is Sermon 55, On the Trinity (1775), preached on 1 John 5:7 — the so-called Johannine Comma, there are three that bear record in heaven. Wesley uses the verse homiletically while knowing its textual standing is doubtful (he says as much in the Explanatory Notes); the honest reader of Wesley should note that the sermon’s argument does not actually depend on the disputed clause, and Wesley’s case stands without it.

The sermon states the Wesleyan posture with unusual exactness, and it maps onto this verse with surgical precision. Wesley affirms the fact without reserve: “I believe this fact also (if I may use the expression), that God is Three and One.” But he refuses to bind the manner: “But the manner how I do not comprehend; and I do not believe it. … I dare not insist upon anyone’s using the word Trinity or Person.” Set that beside the Athanasian Creed and the tension is exact. The creed makes the manner — the precise formula, one God in Trinity, and Trinity in Unity — the catholic faith on which salvation hangs. Wesley confesses the fact the formula states and declines to make the formula itself a test.

And yet — this is the convergence the warning clauses obscure — Wesley and this verse meet on the verb. The Athanasian Creed defines the catholic faith here not as credamus but as veneremur: not as comprehension of the manner but as the worship of the triune God. That is precisely Wesley’s own move. He will not insist you parse the manner; he insists you adore the God who is three and one. The doctrine, for Wesley, “enters into the very heart of Christian piety”: every Christian “worships the Father, the Son, and the Holy Ghost,” whether or not the word Trinity is on the lips. The Methodist Articles of Religion, Article I, confesses “three persons, of one substance, power, and eternity” — the Athanasian doctrine, kept. Wesley deleted the creed (verses 1–2) and kept this verse’s substance and, more deeply, its grammar: the Trinity is for worship.

Charles Wesley made the point a thousand times in verse. The Hymns on the Trinity (1767) — one hundred and eighty-eight hymns — are unum Deum in Trinitate, et Trinitatem in unitate turned into song. Where John guarded the doctrine by refusing to bind the manner, Charles guarded it by never ceasing to praise it. Between them they did exactly what this verse asks: they worshipped one God in Trinity.

Hymnody

If the warning clause of verse 1 has almost no hymnic life, this verse has one of the richest in all of Christian song, because its native act is the one hymnody exists to perform.

“Holy, Holy, Holy! Lord God Almighty!” (Reginald Heber, 1826; tune Nicaea — the name is deliberate) is Trinitas in unitate sung: “God in three Persons, blessèd Trinity.” It is, for most English-speaking Christians, the formula’s primary lived form — learned at the organ, not the desk.

“Come, thou Almighty King” (anon., 1757) addresses the Father, the Son, the Spirit, and then “the great One in Three” — the chiasmus enacted stanza by stanza.

“Of the Father’s love begotten” (Prudentius, 4th c.) carries the doctrine in poetry written in the very century of its conciliar definition.

The Wesleyan corpus is the densest of all. Charles Wesley’s Hymns on the Trinity (1767) is an entire hymnal built on this verse. “Hail, holy, holy, holy Lord” — “supreme, essential One, adored / in co-eternal Three” — is the Athanasian metaphysic with the threat removed and the praise restored. “Maker, in whom we live” moves through Father, Son, and Spirit to the “Triune God” of the fourth stanza.

And the formula’s true daily home is the Gloria Patri — Glory be to the Father, and to the Son, and to the Holy Spirit — said or sung after every psalm in the Office where this creed itself was once recited. The verse is not, finally, a sentence to be parsed. It is the reason the church ends her psalms the way she does.

Pastoral and Liturgical Use

The pastoral key to this verse is the verb the eye skips: veneremur. The catholic faith, the creed says, is to worship one God in Trinity — not to solve one God in Trinity. Almost every pastoral failure around this doctrine begins by mishearing the verb.

The first task is to refuse the math problem. Sooner or later every catechclass, every confirmand, every honest adult asks the question in the form “how can three be one?” — and the question, in that form, is already a wrong turn, because it treats the doctrine as an arithmetic claim (1 = 3) that it has never made. The creed does not say three gods are one god, or three persons are one person; it says three persons, one God — different words on each side of the equation, precisely so that it is not an equation. The pastor’s job is not to win the math argument. It is to move the congregation off the math entirely and back onto the verb: we are not here to compute the Trinity; we are here to worship the Trinity.

The second task is to name the modern idol the doctrine exposes. The contemporary temptation is not Arianism; it is what Rahner diagnosed — a polite, operative monotheism in which “God” is a single undifferentiated benevolence and the Trinity is an awkward technicality the church would rather not have to explain at the door. That reduction is not humility; it is the quiet abandonment of the gospel’s actual content. The God of the gospel is not a generic deity who happens to have a complicated internal arrangement. The God of the gospel is the Father who sends, the Son who saves, the Spirit who sanctifies — and the doctrine of the Trinity is simply the church’s refusal to worship anyone less than the God who actually showed up. A church that finds the Trinity embarrassing has not become more reasonable; it has become less sure who it is praying to.

The third task is to put the doctrine back where it lives — in the liturgy. The congregation already confesses this verse every week without knowing it: in the threefold Name at the font, in the apostolic benediction, in the Gloria Patri after the psalm, in every collect that prays through Jesus Christ our Lord, who lives and reigns with you and the Holy Spirit. The Trinity is not an advanced topic bolted onto Christian worship; it is the shape of Christian worship. The pastor who wants to teach this verse does not need a whiteboard and a diagram of circles. He needs only to slow the congregation down at the Gloria, once, and tell them what they have been saying all along — and that saying it is the catholic faith, not as a password, but as praise.

Further Reading

• Deuteronomy 6:4 — Hear, O Israel: the Lord our God, the Lord is one (the monotheism the doctrine must not compromise)
• Matthew 28:19 — the triune baptismal Name
• John 1:1–18; 14–17 — the Father and the Son and the promised Spirit
• 2 Corinthians 13:14 — the apostolic benediction, the formula at prayer
• 1 John 5:7 (the Johannine Comma) — Wesley’s text in Sermon 55, with the textual caution noted
• Tertullian, Adversus Praxean — the coining of trinitas, persona, substantia
• Athanasius, Letters to Serapion; the Nicene-Constantinopolitan settlement
• Gregory of Nazianzus, Theological Orations (Orations 27–31)
• Augustine, On the Trinity (esp. Books V–VII, XV)
• John of Damascus, On the Orthodox Faith I
• Peter Lombard, Sentences I; Thomas Aquinas, Summa Theologiae I qq. 27–43
• John Calvin, Institutes of the Christian Religion I.13
• The Belgic Confession (1561), Articles 8–9; The Book of Concord (1580), the Three Ecumenical Creeds
• The Articles of Religion of the Methodist Church (1784), Article I
• John Wesley, Standard Sermons, Sermon 55, “On the Trinity” (1775)
• Charles Wesley, Hymns on the Trinity (1767); “Hail, holy, holy, holy Lord”
• Karl Barth, Church Dogmatics I/1, §§8–12
• Karl Rahner, The Trinity (Herder & Herder, 1967)
• Jürgen Moltmann, The Trinity and the Kingdom (SCM, 1981)
• Catherine Mowry LaCugna, God for Us (HarperSanFrancisco, 1991)
• Lewis Ayres, Nicaea and Its Legacy (Oxford, 2004) — on the overdrawn East–West contrast
• Fred Sanders, The Deep Things of God (Crossway, 2010) — the doctrine as the substance of piety