And yet not three eternals, but one eternal

The Text

This is the verse where the Trinity stops being addition. The litany has just said the Father eternal, the Son eternal, the Holy Spirit eternal — and a quick mind, having heard “eternal” three times attached to three names, will draw the obvious conclusion: then there are three eternal ones. Et tamen — “and yet” — non tres aeterni, sed unus aeternus. Not three eternals. One eternal. The most natural inference in the litany is the one the creed exists to forbid.

Then the creed does something easy to miss but decisive: it reaches backward. Sicut — “just as” — and it reruns the same correction over uncreated and immeasurable from verses 8–9. The point of the backward reach is to tell you that verses 11–12 are not a special remark about eternity. They are the rule of the whole litany, stated once, in the middle, and retroactively binding on every attribute before it and every attribute after it. Almighty (v. 14), God (v. 16), Lord (v. 18) will each get the same treatment. This verse is the creed teaching the church how to count — or, more exactly, where counting stops. You may count the persons. You may never count the God.

Translation Notes

et tamen — “and yet.” The doctrine is in the conjunction. Drop et tamen and you have tritheism: three eternals, three uncreateds, three almighties, three Gods. The whole work of the Athanasian Creed is the patient insertion of “and yet” between the true plural predication (each person is eternal) and the false plural conclusion (so there are three eternal things).

non tres aeterni, sed unus aeternus — “not three eternals, but one eternal.” Latin lets a single word, aeternus, do two jobs: as an adjective it attaches to each person (verse 10 — aeternus Pater, aeternus Filius), and as a substantive it can mean “an eternal one.” The creed authorizes the adjective in the plural (the persons, three, are each eternal) and forbids the substantive in the plural (there are not three eternal somethings). The line between what may be said three times and what may be said only once is the line between orthodoxy and tritheism, and it runs exactly here.

sicut non tres increati, nec tres immensi — “just as not three uncreated, nor three immeasurable.” The creed audits its own earlier verses. Whatever the rule is, it is not new at verse 11 and not peculiar to eternity; it governed increatus and immensus the moment they were uttered, and the creed now says so explicitly so that no reader treats the sed unus as a one-time qualification.

the rule beneath the words. What the verse encodes is the classical grammar of Trinitarian predication. Terms that name the essence — eternal, uncreated, immeasurable, almighty, God, Lord — are predicated of the three persons truly and severally (you may say “the Son is eternal”) but of the Godhead only in the singular (you may not say “there are three eternals”). Terms that name the persons and their relations — Father, Son, Spirit, begotten, proceeding — are what may be counted (there are three persons). The shorthand is exact: number the persons; never number the Godhead. “Three persons” is catholic. “Three Gods,” “three eternals,” “three almighties” is the heresy the whole creed is built to exclude.

Historical Context

Gregory of Nyssa, Ad Ablabium. The classic statement of this verse’s problem predates the creed by a century. Gregory’s treatise — its title is literally That We Should Not Think of Saying There Are Three Gods — asks the exact question verse 11 answers: if Peter, James, and John are rightly called three men, why are the Father, the Son, and the Spirit not three Gods? Gregory’s answer is the substance of this verse: the divine nature, unlike human nature, is not parcelled out into separate instances; the three persons do not each have a portion of deity the way three men each have their own humanity, but possess wholly and inseparably the one undivided Godhead, and act with one undivided operation. Non tres aeterni, sed unus aeternus is Gregory’s argument compressed to seven words.

Augustine’s grammar. The Latin form of the rule is Augustine’s, in On the Trinity V–VII: some things are said of God ad se (with respect to himself — substance terms, common, singular) and some relative (with respect to another — the persons, by their relations). Substance is not multiplied by the persons. The creed is Augustine’s distinction made chant-able.

Lateran IV and the Joachite crisis (1215). The rule had to be defended again in the high Middle Ages. Joachim of Fiore accused Peter Lombard of making the divine essence a fourth thing alongside the three persons (a “quaternity”) by speaking of “one supreme reality” that is Father, Son, and Spirit. The Fourth Lateran Council (1215) sided with Lombard and defined the rule precisely: the divine essence is not a fourth reality; the unity is not collective (as a people is one) nor generic (as a species is one) but the one simple substance that is wholly each person. Lateran IV is the medieval church guarding exactly what verse 11 guards: sed unus does not name a fourth thing the three share; it names what each of the three wholly is.

Lines of Interpretation

The doctrine is universal; obeying it is not. The disputed question is whether the rule of verse 11 — count persons, never the Godhead — can actually be kept, or whether one or another account of the Trinity smuggles the forbidden plural back in.

Patristic

Tradition: Gregory of Nyssa, Ad Ablabium; Augustine, On the Trinity V–VII; the Cappadocian doctrine of inseparable operation

The Fathers ground the sed unus in the indivisibility of the divine nature and the unity of divine action: the three never act as three collaborators but as the one God in a single undivided operation, which is why they are not three Gods.

Strengths

• Locates the unity where it can actually hold — in the one undivided nature and operation, not in a tally
• Gives a usable test: if a way of speaking implies three cooperating agents, it has broken the rule

Weaknesses

• The disanalogy with “three men” is subtle and is lost the instant the hearer pictures the persons as three individuals
• “Inseparable operation,” over-pressed, can blur the distinct missions the gospel narrates

Scholastic

Tradition: Lateran IV (1215); Thomas Aquinas, Summa Theologiae I qq. 30–31 (number in God)

Aquinas makes the rule airtight. Number in God is not quantitative (the persons are not three units of a kind that could be summed) but follows from the real relations; the divine essence admits no plural because it is not a form shared among instances but the simple act of being that each person wholly is. “Three” applies to the relations subsisting; it never applies to the essence or its attributes.

Strengths

• The most precise account ever given of why the persons can be counted and the Godhead cannot — number tied to relation, not to quantity
• Lateran IV’s anti-quaternity ruling permanently blocks the subtlest failure mode (treating the essence as a fourth thing)

Weaknesses

• “Non-quantitative number” is a hard saying that protects the rule for the trained and bewilders the untrained
• The technical apparatus can make the living Three feel like a metaphysical construction, the opposite of the creed’s doxological setting

Reformed

Tradition: Calvin, Institutes I.13; Francis Turretin, Institutes of Elenctic Theology III; John Owen

The Reformed scholastics sharpened the sed unus with the formula una numero essentia — the divine essence is one in number, not merely one in kind. Three men share one human nature generically (each has his own instance); the three persons do not share deity generically but possess the numerically single divine essence. This is precisely verse 11’s refusal of “three eternals.”

Strengths

• “One in number, not in kind” states the rule with a precision that closes the generic-unity loophole tritheism uses
• Keeps the doctrine confessional and exegetical, tethered to the Shema and to worship

Weaknesses

• The numerical-essence language, pressed without the relational balance, can tilt toward the modalist ditch (one thing, three labels)
• Reformed scholastic elaboration sometimes multiplies distinctions past the point the simple confession requires

Eastern Orthodox

Tradition: Gregory of Nyssa as the East’s own answer; the Father’s monarchia; perichoresis (mutual indwelling)

The East answers verse 11’s question with three braided guards: the monarchia of the Father (one source, hence one God), the identity of nature, and perichoresis — the persons’ complete mutual indwelling, so that each is in the others and none is a separate instance. The unity is personal and dynamic, not a static singular behind the Three.

Strengths

• Perichoresis gives the most vivid positive picture of why the Three are one without being merged or counted
• Keeps the unity personal — the one God is the communion of the Three, not an essence filed behind them

Weaknesses

• The monarchia, pressed hard, must be stated with great care lest “one because from one” reintroduce gradation
• A strongly personalist account can make the sed unus sound like a community’s unity — exactly the collective unity Lateran IV excluded

Modern / Ecumenical

Tradition: the social-trinitarian debate (Moltmann, Cornelius Plantinga, Swinburne) versus its critics (Brian Leftow, “Anti Social Trinitarianism”; the classical retrieval)

This verse is the precise pressure point of the modern dispute. Social trinitarians begin from three distinct centers of consciousness/will in loving communion and then account for the unity; their critics charge that this counts three first and adds oneness afterward — which is exactly the move verse 11 forbids (three eternals, plus a unity, is still three eternals). The classical side insists the rule means the unity is not added to the three but is what each of the three wholly is.

Strengths

• Social trinitarianism rightly recovers the concrete, scriptural persons and the relational life the bare sed unus can seem to flatten
• The exchange has forced unprecedented precision about what “one God” can and cannot mean, with verse 11 functioning as the shared criterion

Weaknesses

• Strong social models struggle to avoid the forbidden plural — three minds with a unity is, by the creed’s grammar, three Gods
• The classical reply, if it answers only by negation, can leave the persons looking thin; the verse demands one resist tritheism without lapsing into modalism, and not every modern account manages both

Wesleyan Voice

This verse is the precise object of Wesley’s most quoted Trinitarian sentence. When Wesley says, in Sermon 55, On the Trinity, “I believe this fact … that God is Three and One. But the manner how I do not comprehend; and I do not believe it,” the manner he refuses to bind is exactly the logic of verses 11–12 — the rule of predication, the non tres sed unus, the grammar of how three can be one without being three of anything. Wesley’s point is not that the rule is false. It is that the rule is not the gospel, and ought not be made a barbed-wire fence around the kingdom: “I dare not insist upon anyone’s using the word Trinity or Person.”

And yet — this is the part too easily missed — Wesley keeps the rule on every page. He never writes “three Gods.” He never says “three eternals.” His settled formula is the catholic one: one God in three persons. He observes verse 11 scrupulously while declining to make verse 11 a test. That is not inconsistency; it is the exact Wesleyan distinction between the faith (which the rule protects) and a technical mastery of the rule (which salvation does not require). It also explains his caution about the word person (see [[athanasian-creed/neither-confounding-nor-dividing]]): Wesley had seen that an untrained hearer, given “three persons” without verse 11’s “and yet,” will reliably arrive at three Gods. His pastoral reticence is verse 11’s prohibition, applied to preaching: keep the people from the forbidden plural by not handing them the dangerous count without the rule that governs it.

Charles Wesley kept the rule the way the hymnody always keeps it — by never letting the three stand without returning them to the one. His Trinity hymns enumerate the persons and then close, every time, on one — “essential One, adored / in co-eternal Three.” The plural is sung; the singular always has the last word. That cadence is verse 11: not three … but one.

Hymnody

There is no hymn that argues the rule of predication — you cannot set “non-quantitative number” to a tune — but there is a vast body of hymnody that obeys it, and the obedience is audible in a single recurring move: the three are named, and the stanza will not let them rest until they are returned to one.

“Holy, Holy, Holy! Lord God Almighty!” enacts verse 11 in one line: “God in three Persons” — the count — held inside “Lord God Almighty,” singular — the sed unus. The hymn says “three” and “one” in the same breath and refuses to let either go.

The Gloria Patri is verse 11 in liturgical form: three persons named in sequence, then as it was in the beginning, is now, and ever shall be, world without end — the long singular cadence that gathers the three back into the one and the everlasting. It does not explain the rule; it performs it, after every psalm.

Charles Wesley’s Trinity hymns are a sustained drill in the same cadence: the persons distinguished stanza by stanza, the doxology always landing on the undivided One. The honest summary is that the church has never needed a hymn about verse 11, because verse 11 is the law that shaped how she ends every Trinitarian hymn she has.

Pastoral and Liturgical Use

This is the verse that answers the one question every catechumen, every honest adult, and every skeptic eventually asks: so is it three Gods or one? The creed’s answer is not a clever reconciliation. It is a rule about where to stop counting, and it is the single most useful thing a pastor can hand a confused believer.

Teach the rule in one sentence: count the persons, never the God. You may say — the creed has just said — that the Father is eternal, the Son is eternal, the Spirit is eternal. Three real, distinct persons; you are permitted, even required, to name all three. What you may not do is turn around and say “so there are three eternal beings,” “three almighties,” “three Gods.” Those words have no plural in Christian speech. The persons are three; the God is one; and the reason it is not a contradiction is that person and God are not the same kind of word, so they are not counting the same thing. The believer who grasps just this — that “three” lands on persons and “one” lands on God, and that the sentence was never “three of one thing” — has been handed the key to the entire doctrine in a form he can keep.

Name the idol under the question. The reason “is it three or one?” feels so urgent to the modern mind is that the modern mind wants the Trinity to add up — to be mastered, resolved, made to behave like arithmetic — and a God who can be made to add up is a God small enough to be managed. Verse 11 refuses the sum on purpose. It does not fail to make the math work; it tells you the math was the wrong tool. The pastoral good news here is genuinely freeing, and worth saying plainly to the anxious: you were never asked to solve 1 = 3. You were told that the answer is not a number at all — that God is not a quantity, that worship is not computation, and that the relief you were looking for in a clever explanation is actually found in giving up the demand to explain and joining the church in saying one God, with the three on your lips and the one in your heart.

Let the liturgy do the counting for them. The pastor does not need to win this on a whiteboard. The congregation already keeps verse 11 every Sunday: every Gloria names the Three and ends on the One; every Trinity hymn enumerates and then resolves; every collect prays to the Father, through the Son, in the Spirit, and signs off one God, now and for ever. Point at it once. Tell them the church has been obeying the eleventh verse of the Athanasian Creed in their mouths their whole lives — naming three, worshipping one — and that this practiced cadence, not a successful equation, is how the catholic faith has always held what cannot be added up.

Further Reading

• Deuteronomy 6:4; Mark 12:29 — the Lord our God, the Lord is one (the singular the rule protects)
• Matthew 28:19 — three named in one Name
• John 10:30 — I and the Father are one; John 17:21–22 — the unity of the Three
• 1 Corinthians 8:6; 12:4–6 — one God, named as Father, Lord, Spirit
• Gregory of Nyssa, Ad Ablabium (That We Should Not Say There Are Three Gods)
• Augustine, On the Trinity, Books V–VII
• Fourth Lateran Council (1215), Constitution 2 (against Joachim of Fiore; the anti-quaternity rule)
• Thomas Aquinas, Summa Theologiae I qq. 30–31
• John Calvin, Institutes I.13; Francis Turretin, Institutes of Elenctic Theology, Third Topic
• John Owen, Of Communion with God; A Brief Declaration … of the Trinity
• The Articles of Religion of the Methodist Church (1784), Article I
• John Wesley, Standard Sermons, Sermon 55, “On the Trinity”
• Charles Wesley, Hymns on the Trinity (1767)
• Cornelius Plantinga Jr., “Social Trinity and Tritheism,” in Trinity, Incarnation, and Atonement (1989)
• Brian Leftow, “Anti Social Trinitarianism,” in The Trinity, ed. Davis, Kendall, O’Collins (Oxford, 1999)
• Lewis Ayres, Nicaea and Its Legacy (Oxford, 2004)