The Mystagogy of the Holy Spirit

1. The Filioque's Neoplatonic Roots Undermine Divine Simplicity

The doctrine of the dual procession cannot be properly understood without a correct evaluation of the impact of Saint (the Blessed) Augustine, nor can it be properly understood divorced from its context in the Augustinian program of theodicy.

Philosophical foundation. The filioque doctrine, asserting the Holy Spirit's procession from both the Father and the Son, finds its philosophical underpinnings in Neoplatonism, particularly Plotinos' concept of the "One." This "One" is defined by absolute simplicity, where its being, will, and activity are considered "wholly indistinguishable." This philosophical framework, when applied to Christian theology, leads to a problematic understanding of God's nature and actions.

Augustine's synthesis. Saint Augustine, in his attempt to reconcile Christian faith with Neoplatonic philosophy, adopted this definition of divine simplicity as the ultimate basis for understanding the Christian Trinity. This uncritical acceptance meant that the philosophical and theological elements of his thought became intimately intertwined, creating an inherent ambiguity. This synthesis, while aiming to defend the rationality of faith, inadvertently introduced a logical dynamic that would profoundly shape Western Trinitarian thought.

Consequences of simplicity. The Neoplatonic simplicity, when applied to God, implies that creation is not a free act but a necessary "overflowing of the divine essence." This blurs the distinction between God's essence and His energies, and between theology (God in Himself) and economy (God's actions in the world). Such a definition also struggles with the plurality of divine persons, as simplicity tends to collapse all distinctions into an undifferentiated unity or expand into an infinite series of beings.

2. Augustinian Theology Subordinates Persons to Abstract Essence

For Augustine, existence itself is not relative; what is relative. Person is not identical to the essence. Person becomes merely another aspect of existence; for God to exist is the same as to be person, just as it is the same to be good, just, and wise.

Essence over persons. Augustinian theology, by assuming the divine essence as simple and prior, effectively subordinates the distinct persons of the Trinity to this abstract concept of unity. The Father, Son, and Holy Spirit are treated as "relative terms" to each other, rather than absolute hypostases. This approach begins with the essence, then considers attributes, and only finally addresses the persons, reversing the traditional Patristic order that starts with the persons.

Attributes and persons. In this framework, the persons and attributes are accorded the same logical status, leading to a blurring of their distinctions. Augustine states that "to Him to be is the same as to be God, or as to be great, or as to be good, so it is the same thing to Him to be as to be a person." This implies that persons can be seen as mere aspects or definitions of the divine essence, rather than unique, distinct hypostases. The consequence is that the divine essence becomes an impersonal abstraction binding the pluralities together.

Impersonal Godhead. This theological structure risks conceiving of God in all His fullness "independently of the three persons," leading to an impersonal understanding of the Godhead. The Quicumque Creed, influenced by Augustine, begins by professing faith in the Godhead common to the three persons, rather than starting with the Father as the sole source. This shift in emphasis from the personal Father to an abstract, simple essence is a critical divergence from Eastern Patristic thought.

3. Dual Procession Destroys the Father's Monarchy and Implies a Composite Spirit

Is it possible to avoid the conclusion that the Spirit has been divided into two? On the one hand, He proceeds from the Father, Who is the First cause and also unoriginate. On the other hand, however, He proceeds from a second cause, and this second cause is not underived.

Two causes for the Spirit. The filioque doctrine introduces two distinct causes for the Holy Spirit's procession: the Father as the uncaused, first cause, and the Son as a caused, second cause. Saint Photios argues that this dual causality inevitably leads to the conclusion that the Holy Spirit is "composite," as He derives His existence from two different types of sources. This directly contradicts the divine simplicity and unity of the Trinity.

Undermining the Monarchy. Orthodox theology emphasizes the Father as the sole principium (source or principle) of the Godhead, from whom both the Son is begotten and the Holy Spirit proceeds. The filioque, by making the Son also a cause of the Spirit, introduces a second principle within the Trinity, thereby destroying the Father's unique monarchy. Photios asks, "Which one of the persons is the divine principle?" highlighting the confusion this creates regarding the ultimate source of divinity.

Spirit's diminished dignity. If the Spirit proceeds from the Son, who is Himself begotten, it implies a subordination of the Spirit. Photios points out that the Spirit would then have "two distinctions," being caused by both an unoriginate and a derived cause, making Him "inferior to each of the other two persons." This diminishes the Spirit's co-equal honor and dignity, echoing ancient heresies that denied the full divinity of the Holy Spirit.

4. The Filioque Echoes Ancient Trinitarian Heresies

The resemblance that this energy in the structure of Eunomios bears to the attributes in Augustinian triadology is more than coincidental.

Arian and Eunomian parallels. Saint Photios, drawing on earlier Patristic refutations, demonstrates that the logical dynamics of the filioque bear striking structural similarities to ancient Trinitarian heresies. Arianism, for instance, defined deity by the Father's causality, making the Son a creature. Similarly, Eunomianism made the Son a product of the Father's "energy" and the Spirit a "work" of both the Father and the Son, creating a hierarchical subordination of divine persons.

Subordinationist implications. Just as Arians and Eunomians subordinated the Son by making Him a caused being or a product of an energy, the filioque subordinates the Holy Spirit by making Him proceed from a "caused cause" (the Son). Photios argues that if the Son, as a cause, makes the Spirit proceed, then logically, another person should proceed from the Spirit, leading to an infinite multiplication of persons and ultimately "Greek polytheism," a concern previously raised by Saint Athanasios against Arian logic.

Sabellian and Binitarian tendencies. The filioque also risks collapsing distinctions between persons, leading to a form of "semi-Sabellianism." By making the Spirit the "substantial and consubstantial love of both" the Father and the Son, and identifying Him with the divine essence, the doctrine tends to reduce the Trinity to a dyad of Father-Son opposed to an impersonal Essence-Spirit. This constant "dialectic of love" within Augustinian thought, where unity unfolds into plurality and collapses back into unity, ultimately compromises the distinct hypostatic reality of the three persons.

5. Scriptural Phrases Misinterpreted as Proof of Dual Procession

The Savior did not say, “He will receive from me,’’ but, ‘He will receive from that which is mine.’”

"From that which is mine." Proponents of the filioque often cite Christ's words, "He will receive from that which is mine and will proclaim Him to you," as scriptural proof for the Spirit's procession from the Son. Saint Photios meticulously refutes this interpretation, explaining that "from that which is mine" refers to the Father's possessions, which the Son shares, and thus the Spirit receives from the Father through the Son's glorification, not from the Son as a co-cause of His procession.

"Spirit of His Son." Similarly, the Apostle Paul's phrase, "God sent the Spirit of His Son into our hearts," is used to support the dual procession. Photios clarifies that "Spirit of His Son" signifies the Spirit's consubstantiality with the Son and His mission in the economy of salvation, not His eternal ontological procession. He argues that if "Spirit of the Son" implied procession, then by the same logic, "Father of the Son" would imply the Father is begotten, which is absurd.

Distinction between procession and mission. Photios emphasizes the crucial distinction between the eternal procession of the Holy Spirit (His origin from the Father) and His temporal mission or sending into the world (His activity through the Son). The scriptural passages cited by filioque advocates, he contends, speak to the latter—the Spirit's mission and His intimate relationship with the Son—not to a dual origin of His very being. To confuse these is to distort the revealed truth about the Trinity.

6. Patristic Authority Misused to Justify Dogmatic Innovation

If those fathers who taught such opinions did not alter or change the correct statements, then you who teach your word as a dogma — again, this is another slander against your fathers — bring your own stubbornness of opinion into the teachings of those men.

Individual vs. conciliar authority. Saint Photios strongly criticizes the practice of elevating individual statements from Western Fathers like Ambrose, Augustine, and Jerome, which might contain phrases suggesting the filioque, to the status of universal dogma. He argues that these Fathers, while holy and venerable, were human and could have erred or used imprecise language, especially when writing in specific contexts (e.g., combating heresy). Their individual opinions cannot override the unanimous consensus of Ecumenical Councils.

"Killing their fathers." Photios accuses filioque proponents of "killing their fathers" by misinterpreting their writings and imposing a novel dogma upon them. He suggests that if these Fathers did indeed use such phrasing, it was either through "ignorance or oversight," or their intent was not to establish a dual procession as a dogmatic truth. To declare it a dogma now, based on their words, is to "falsely accuse the Master to be in advocacy of another doctrine" and to "cast down their great honor with blasphemy."

The true Patristic witness. Photios asserts that the true Patristic witness, particularly as enshrined in the Ecumenical Councils, consistently affirms the Holy Spirit's procession from the Father alone. He cites figures like Leo the Great, Vigilius, Agatho, Gregory, and Zacharias, all Roman bishops, who upheld this traditional doctrine. He challenges his opponents to acknowledge these "fathers of the Fathers" who explicitly condemned any alteration or addition to the Creed.

7. Latin Language Inadequacy Contributed to Theological Divergence

Because the Latin language, frequently used by our holy fathers, has inadequate meanings which do not translate the Greek language purely and exactly, and often render false notions of the doctrines of the Faith, and because it is not supplied with as many words that can interpret the meaning of a Greek word in its exact sense, that God-inspired man fixed the concepts, decreeing and supplying the holy doctrines of the faith in the Greek tongue.

Linguistic limitations. Saint Photios highlights a critical factor in the divergence between East and West: the inherent limitations of the Latin language in precisely translating the nuanced theological terminology of Greek. Greek, with its richer vocabulary, allowed for clearer distinctions between concepts like ousia (essence) and hypostasis (person), and between ekporeusis (procession) and pempis (sending). Latin often struggled to capture these subtleties, leading to potential misunderstandings.

Impact on Trinitarian doctrine. The lack of precise Latin equivalents for Greek terms, particularly concerning the origin of the divine persons, contributed to the ambiguity that allowed the filioque to develop. What might have been an imprecise or contextual statement in Latin could be interpreted as a definitive dogmatic assertion of dual procession, which was not the original intent or understanding in the Greek-speaking East.

Leo's Greek decree. Photios points to Pope Leo the Great's decree, confirmed by the Fourth Ecumenical Council, which explicitly affirmed the Holy Spirit's procession from the Father in the Greek language. This act, according to Photios, was a conscious effort to "restore" the inadequacy of the Latin tongue to "harmonious perfection" by adopting the precise Greek theological formulations, thereby expelling "heterodox notions" that might arise from linguistic imprecision.

8. The Holy Spirit's Equal Dignity and Simple Nature are Compromised

Thus the Spirit’s equal dignity is blasphemed, once again giving rise to the Macedonian insanity against the Spirit.

Diminished status. The filioque doctrine, by making the Holy Spirit proceed from the Son (a begotten person) as well as the Father (the unoriginate source), implicitly diminishes the Spirit's co-equal dignity within the Trinity. Photios argues that this introduces a hierarchy where the Spirit is distinguished by "more personal properties than the Son of the Father," making Him "inferior to each of the other two persons." This echoes the Macedonian heresy, which denied the full divinity of the Holy Spirit.

Composite Spirit. If the Spirit proceeds from two distinct causes—one unoriginate and one derived—Photios logically concludes that the Spirit must be "composite." This directly contradicts the fundamental Christian understanding of God as simple and uncomposed. A composite Spirit cannot be truly God in the same sense as the Father and the Son, who are simple and uncaused in their ultimate origin.

Loss of simplicity. The introduction of a dual procession, and the subsequent implication of a composite Spirit, fundamentally undermines the divine simplicity of the entire Trinity. Photios asks, "How then is the Trinity simple?" if one of its persons is understood as deriving from two different classes of causes. This internal contradiction, he argues, transforms the awesome mystery of the Trinity into a "frivolous display of knowledge" that ultimately leads to theological absurdity.

9. The Father's Unique Causality Preserves Trinitarian Order

The Father is the personal cause of the person of the Word. But if, as this ungodly doctrine asserts, the Son is also a cause of the Spirit, then the personal feature of the Father is distributed to the Son.

Father as sole source. Orthodox theology firmly upholds the Father as the sole principium (source or cause) of the Godhead. From the Father alone, the Son is eternally begotten, and the Holy Spirit eternally proceeds. This doctrine of the Father's monarchy ensures the unity of the Trinity while preserving the distinct hypostatic properties of each person. The Father's unique personal property is to be uncaused and to cause the other two persons.

Distribution of causality. The filioque, by asserting that the Son is also a cause of the Spirit, "distributes" the Father's unique personal property of causality to the Son. Photios argues that this not only confuses the distinct properties of the persons but also implies that the Father's person is "imperfect, wanting completion," with the Son taking over part of the Father's role. This effectively reduces the Trinity to a "mere dyad" or introduces "two interchangeable causes."

Maintaining distinctions. Photios stresses that the specific personal distinctions of the Father (unoriginate causality), the Son (begottenness), and the Holy Spirit (procession from the Father) are immutable and essential for understanding the Trinity. Any doctrine that blurs these distinctions, either by making persons into attributes or by introducing multiple sources, leads to theological confusion and heresy. The Father's unique causality is the bedrock upon which the distinct yet unified nature of the Trinity rests.