Eusebius of Emesa’s Trinitarian Theology: A Study in Mid-Fourth Century Christology 📖

This examination draws from Robert E. Winn’s Eusebius of Emesa: Church and Theology in the Mid-Fourth Century (The Catholic University of America Press, 2011), specifically pages 163–177. Eusebius of Emesa, bishop and student of Eusebius of Caesarea, offers a crucial window into how fourth-century theology navigated the relationship between Father, Son, and Holy Spirit.

---

The Evolution of Eusebius’s Theological Emphasis

Eusebius’s approach to Trinitarian theology shifted significantly over his episcopal career. Early in his preaching, his concern centered on affirming both unity and distinction between Father and Son, but by the time he delivered his Jerusalem series, his emphasis had changed dramatically. Rather than stress the hierarchical aspects of church theology, he moved toward emphasizing the common nature and essence shared by the Father and the Son. This development is evident not only in his Christology but also in his treatment of the Holy Spirit’s relationship within the Godhead. While his earlier sermons contained only rudimentary Trinitarian theology, the Jerusalem series expressed this doctrine with far greater precision and theological maturity.

---

The Holy Spirit: From Implicit to Explicit Divinity

Recognition of the Spirit’s Full Divinity

Most mid-fourth-century creeds treated the Holy Spirit only incidentally, rarely attempting to define precisely his relationship to Father and Son. Eusebius, by contrast, developed a substantive theology of the Spirit that extended beyond mere acknowledgment of his existence in the baptismal formula. By the time of the Jerusalem series, he was fully comfortable affirming the Spirit’s complete divinity—a position hinted at throughout his earlier sermons but stated explicitly in his sermon De fide, habita Hierosolymis.

The Spirit as God’s Self-Knowledge

Drawing on 1 Corinthians 2:10–11, Eusebius reasoned that just as only a human spirit fully understands a human person, so only the Spirit from God possesses true knowledge of God. This argument served his broader thesis: the Spirit of God is God with the Father and the Son. By locating the Spirit’s knowledge within the divine nature itself, Eusebius positioned him as an insider to the Godhead, not merely an instrument or creature.

---

The Language of Divine Incorporeality

Paralleling God’s Attributes

A careful reading of Eusebius’s sermons reveals he frequently described the Holy Spirit using language he employed elsewhere for God himself. In De Filio, for instance, he drew on arguments about incorporeality (developed in De incorporali) to establish that the Spirit, though present to many and distributed among them, cannot be divided into parts. His reasoning: the Spirit, like God, is by nature incorporeal and transcendent of all place. This parallel treatment suggests that in Eusebius’s cosmic hierarchy, the Spirit occupied the same fundamental status as God.

The Fire Analogy

In De imagine—where he discussed the Holy Spirit most extensively—Eusebius employed fire as an analogy to explain how the Spirit remains unified while filling all things. Just as fire is present to and affects many objects while retaining its integrity, so the Spirit fills apostles, prophets, angels, and archangels while preserving his undivided unity. This comparison served to prove the Spirit’s superiority over creation and his divine transcendence—the very attributes that distinguish God from the created order.

---

The Hierarchy of Being and the Spirit’s Place

Above Angels, Beneath the Son

Eusebius’s cosmic hierarchy, dependent on nature and power, placed the Holy Spirit at a level above the angels but beneath the Son. The Spirit cannot be compared to angels; he surpasses them in power. Yet the “undivided and effectual Spirit” fills not only the highest orders of creation but also penetrates the entire created cosmos. This positioning—neither angel nor creature, yet ordered to the Son—reflects Eusebius’s attempt to articulate the Spirit’s unique status within the divine economy.

The Spirit’s Universal Presence and Selective Indwelling

Eusebius resolved an apparent paradox: How can the Spirit be omnipresent yet only fill those who receive his grace? He compared the Spirit to a book placed in a public square—available to all but understood only by the literate. The Spirit’s presence is universal; his transformative grace is selective. This distinction allowed Eusebius to maintain both the Spirit’s transcendence and his saving efficacy without diminishing either.

---

The Problem of Analogy and the Ineffable

Hesitation Toward Definition

Despite employing analogies to prove the Spirit’s superiority, Eusebius expressed deep hesitation about using them. Moving from discussion of the Spirit to discussion of the Son in De imagine, he confessed that analogies, however useful, ultimately fail to capture the Spirit’s true nature. The Spirit is ineffable, worthy of fear, and no comparison drawn from creation can do him justice. This theological restraint reflects a patristic conviction: the infinite transcends finite language.

---

Trinitarian Formulas: The Doxologies

“Worshiping One, Through One, and In One”

Eusebius concluded most sermons with doxologies modeled on the epistle of Jude 25, expressing the formula: “worshiping one, through one and in one.” A typical benediction reads:

“Let us return glory to the one through one and in one from the one church: to the unbegotten Father, through the only-begotten Son, in one Holy Spirit glory, power, honor, both now and always and throughout all ages. Amen.”

In some variations, he connected the Holy Spirit to the Father and Son using the preposition “with,” while in others he reduced the formula simply to giving “honor to the Trinity.” These variations, while verbal, carry a consistent theological implication: the Spirit deserves the same glory and honor due to Father and Son.

The Significance of “One and One and One”

Eusebius’s repeated use of the adjective “one” served multiple purposes. The formula “one and one” or “one from one” expressed both the unique, independent existence of Father and Son and the common divinity they shared. When extended to include the Spirit—”one and one and one”—this language suggested a parity among the three and implied that the Spirit’s relationship to Father and Son mirrors the Son’s relationship to the Father. That Eusebius offered glory, honor, and power to all three in these doxologies underscores their fundamental equality.

---

The Essence and the Persons: De fide, habita Hierosolymis

The Full Statement

The most explicit and systematic expression of Eusebius’s Trinitarian theology appears in the Jerusalem sermon. Here he articulated the relationship between essence and person with unprecedented clarity:

“Everything that the Father is, the Son is the same, except that he is not Father. Everything that the Son is, the Father is the same, except that he is not Son and did not take flesh. And everything which the Father and the Son are, the Holy Spirit is the same except that he is not Father or Son, and did not become flesh as the Son.”

He then illustrated this with the attribute of life itself, present in Father, Son, and Spirit. The conclusion is unambiguous: “There is one Lord and one God and one king. We confess the Holy Trinity and not lords and gods and kings.”

The Seraphim’s Cry

Eusebius grounded this theology in Scripture, invoking Isaiah’s vision of the seraphim crying “Holy, holy, holy”—three times holy, one time Lord. This biblical image, repeated three times, expresses three distinct persons; the single proclamation of lordship expresses their unified divine nature. The liturgical tradition of the Church, Eusebius insisted, already contained this Trinitarian confession.

God with God

In a final summary passage, Eusebius crystallized his position:

“Indeed, saying ‘God with God’ is a name of God. God with God and not gods. We do not confess two unbegottens or two begottens but one unbegotten and one offspring and one Spirit of truth who proceeds from the Father. Three and one; one and three. And because we confess one essence of the Holy Trinity perfect in three states of persons.”

This formula—”Three and one; one and three”—captures the paradox Eusebius sought to articulate: numerical distinction and essential unity coexist in the Godhead. The three persons are not three separate gods; the one essence is not a fourth thing standing behind them. Rather, the single divine nature exists in three irreducible personal modes.

---

The Shift from Subordinationism

Rebalancing the Inherited Theology

Eusebius inherited from his mentor, Eusebius of Caesarea, a theology of subordination—the notion that the Son and Spirit, while divine, occupied a lower rank in the cosmic order. By the time of the Jerusalem series, he found this rigid hierarchy increasingly problematic. Rather than abandon it entirely, he attempted to smooth its rough edges by emphasizing the essential equality of Father, Son, and Holy Spirit alongside their real distinctions.

One Line of Demarcation: Creator and Creature

In Eusebius’s mature theology, the fundamental boundary in the cosmos runs between Creator and creation. The economic distinctions within the Godhead—Father, Son, and Spirit in their respective roles—pale in comparison to the absolute divide separating divine from creaturely being. This conviction led him to insist firmly and repeatedly that all three persons of the Trinity belong unambiguously on the Creator side of this cosmic divide. To leave any doubt about the full divinity of the Son or Spirit was, in effect, to blur the line between God and creation itself.

---

Conclusion: A Bridge Between Eras

Eusebius of Emesa stands as a transitional figure in fourth-century Trinitarian theology. He received the theology of subordination from Caesarea yet moved toward the more balanced formulations that would characterize later patristic Trinitarian doctrine. His insistence that Father, Son, and Holy Spirit share one divine essence while remaining three distinct persons, his careful analogies drawn from creation to illuminate (without defining) the ineffable mystery, and his liturgical emphasis on equal honor to all three—these elements prefigure the theological precision that would crystallize at the Council of Constantinople in 381.