On the Twofold Truth of Theology
Veritas theologiae duplicem habet formam: internam, quae consistit in felicitate Spiritu data intra linguam fidei (T), et externam, quae consistit in adaequatione huius linguae ad esse divinitus constitutum. Hae duae veritates, distinctae sed ordinatae, in Christo, qui est Verbum et Res, uniuntur.
We might speak of the truth of theology as twofold: internal truth, which consists in Spirit-given felicity within the language of faith T, and external truth, which consists in the adequation of that language to the reality constituted by God. The two are distinct but ordered to one another, and they find their unity in Christ, who is both Word and Reality.
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Thesis
Theology possesses both an internal and an external truth.
Internal truth (veritas interna) refers to the coherence and felicity of theological speech as governed by the Spirit within the community of faith.
External truth (veritas externa) pertains to the correspondence or adequacy of that speech when interpreted within being, its fulfillment in the order of reality that God creates and sustains.
Together they form a single movement from faith’s language to God’s reality and back again.
Locus classicus
“I am the way, and the truth, and the life.” — John 14:6
“I am the way, and the truth, and the life.” — John 14:6
In this saying, Christ names Himself not merely as speaker of truth but as Truth itself. The theological word thus possesses two dimensions: it is true in faith because it participates in Christ’s own utterance, and it is true in being because Christ Himself is what the Word declares.
Explicatio
In previous disputations, theology was described as a formal language T, authorized by the Spirit, and interpreted within models that link language to being. Here we consider what it means to say that such theological expressions are true.
In logic, truth is often defined by correspondence: a sentence is true when what it says obtains in the world. In theology, that notion must be qualified. Theology’s words do not first describe and then verify; they participate in divine speech.
To express this participation, we distinguish between two levels of truth:
Internal truth (veritas interna) occurs within the system of theological language itself. We might say that a tatement is internally true when it is felicitous, when it coheres with Scripture, doctrine, and Spirit-guided discourse. For instance, “Christ is Lord” is internally true because it is consonant with the grammar of faith T as the Spirit has given it.
Symbolically, we may call the internal measure of this truth FT, the felicity conditions of T. These conditions ensure that theology speaks rightly, even before modeling connects it to being.
External truth (veritas externa) arises when the same expression is interpreted within a model of reality M, yielding what we earlier called TC, or truth conditions. These are the states of affairs, the real relations, events, or properties through which God’s Word is fulfilled in the world.
In simple terms: FT + Modeling = TC. That is, when Spirit-given felicity joins ontological adequacy, the statement is true in both faith and fact.
This distinction does not divide truth into two different kinds but shows its two dimensions. Internal truth without external fulfillment is mere coherence; external truth without inner authorization is unfettered speculation. Only when the Spirit unites both does theology achieve full truth.
Objectiones
Obiectio I. Thomas Aquinas maintains that truth is the adequation of intellect and thing (adaequatio intellectus et rei). Theology, insofar as it concerns divine things, must therefore have a single, objective truth grounded in God’s being. To posit a “double truth” in theology would divide divine reality from its cognition and collapse truth into mere human interpretation.
Obiectio II. Late medieval nominalism holds that theological statements possess truth only insofar as they express the divine will revealed in Scripture. There is no ontological correspondence beyond God’s voluntary decree. To speak of an “ontological truth” in addition to a “formal” or linguistic one is to reintroduce metaphysical realism against the simplicity of God’s sovereignty.
Obiectio III. For Kant, all human knowledge is conditioned by the forms of intuition and categories of the understanding. “Theology” may express moral faith but cannot claim objective correspondence to the divine. Any “double truth” distinguishing linguistic coherence from ontological reality confuses the distinction between phenomena and noumena. The only truth theology can have is practical, not ontological.
Obiectio IV. George Lindbeck and others argue that theological truth resides within the coherence of a community’s grammar. There is no “ontological truth” to be accessed beyond the language of faith. To posit a second, deeper truth is to reintroduce the very representationalism Lindbeck rejects. Theological truth is singular and intralinguistic; there is no duplex veritas.
Obiectio V. From a constructivist or deconstructive standpoint, all claims to “truth” are historically contingent linguistic performances. A “double truth” merely multiplies illusions. Theology’s so-called ontological truth is only a higher-order fiction meant to stabilize its discourse. Truth is produced, not revealed.
Responsiones
Ad I. Thomistic realism correctly grounds truth in the relation between intellect and being, yet theology’s intellect is not autonomous but pneumatic. Its formal truth, the coherence and intelligibility of theological language, is secured within the human domain. Its ontological truth, the correspondence of that language to divine reality, is effected by the Holy Spirit, who bridges word and being. These two aspects are not contradictory but correlative; the Spirit makes the formal act of saying coincide with the divine act of being.
Ad II. Nominalism preserves God’s freedom but severs divine willing from ontological intelligibility. The “double truth” of theology does not undermine divine sovereignty; it clarifies its modes of manifestation. God’s will becomes present formally in the human act of confession and ontologically in the reality the confession names. The Spirit unites both, ensuring that what is truly said in faith corresponds to how God truly is, and without collapsing divine causality into human speech.
Ad III. While Kant’s distinction between phenomena and noumena limits knowledge to the conditions of human sensibility, theological truth concerns divine communication. The Spirit renders finite intellects proportionate to divine truth without violating their transcendental structure. The duplex truth of theology honors both sides: the formal truth proper to human language and the ontological truth granted by divine participation. Revelation transforms the limits of reason into avenues of communion.
Ad IV. Post-liberal theology rightly emphasizes the communal and grammatical dimensions of faith, but its refusal of ontological reference renders theology self-enclosed. The double truth affirms that grammar and reality are distinct yet related: theological statements are formally true as expressions within a rule-governed practice, and ontologically true insofar as that practice participates in divine being through the Spirit. The grammar of faith is sacramental; it mediates what it signifies.
Ad V. Constructivism dissolves truth into performance, yet it inadvertently testifies to a real difference between the act of speaking and what the act seeks to convey. The duplex truth acknowledges that difference while grounding it in divine causality. The Spirit authorizes human constructions as instruments of revelation, preserving their historical finitude while ensuring participation in the eternal. Theological truth is neither illusion nor production but participation in a Word that precedes every word.
Nota
Picture the unity of these two truths as a circle rather than a line. Theological language begins with T, the grammar given by the Spirit. Within T, internal truth arises through faithful speech. This language is then modeled into reality M, producing external truth as divine being answers divine word. The resulting adequacy returns again to renew T, forming a continual exchange between language and being, grace and truth.
When theologians write FT + Modeling = TC, they are not composing an equation but naming a semantic reality: felicity (Spirit-authorized speech) joined to modeling (Spirit-interpreted being) yields theological truth. It is a symbolic shorthand for Luther’s claim that God’s Word is true because it does what it says.
Christ Himself is this coincidence of internal and external truth, the Word that is also the world’s fulfillment. To confess that “the Word became flesh” is to say that God’s internal Word (eternally spoken) has become externally real in history.
Determinatio
From the foregoing it is determined that:
Theology possesses both an internal truth (felicity within the Spirit-governed language of faith) and an external truth (adequacy to divine reality).
These two are ordered, not opposed: internal truth grounds theology’s faithfulness, external truth secures its realism.
Christ, as both Word and Reality, is the unity of these two modes of truth.
The Spirit mediates their conjunction, ensuring that the truth of faith is neither abstract nor speculative but living and enacted.
Hence, theology’s veracity is neither purely linguistic nor purely ontological; it is incarnational, the meeting of speech and being in the Spirit of Christ.