Section 03: Trinitarian Theology
St. Gregory the Theologian’s central and abiding contribution: the perfecting of Nicene Trinitarianism. This section sets out his doctrine of the one Godhead in three coequal hypostases distinguished only by the relations of origin, his explicit confession of the Spirit as God, and the Christology and soteriology — “what is not assumed is not healed” — that grew from the same root and shaped the later christological councils.
Tradition: Pan-Orthodox (Church Father)
Contents
| File | Topic |
|---|---|
| Trinity Perfected | The monarchy of the Father with full equality; the relations of origin as the sole distinctions; “the Spirit is God” (Or. 31); why the Creed of 381 reflects his theology |
| Christology and Soteriology | “What is not assumed is not healed” (Ep. 101); the full humanity of Christ against Apollinarius; theosis as the aim of the Incarnation; the authority of Ep. 101 at Ephesus and Chalcedon |
How to Use
- Read Trinity Perfected first: it is the dogmatic centre of the collection and the reason Gregory bears the title “the Theologian.”
- Read Christology and Soteriology for the way his Trinitarian vision issued in a soteriological Christology — only a fully human Christ can heal a fully fallen humanity, and the end of the Incarnation is deification.
Why This Section Matters
Nicaea (325) confessed the Son homoousios with the Father but said of the Spirit only “and in the Holy Spirit.” Two generations later the divinity of the Spirit was still contested by the Pneumatomachi, and even Basil had defended the Spirit’s honour without quite calling him God. Gregory removed the reserve, confessing the Spirit to be God and consubstantial and grounding the whole Trinity in the monarchy of the Father held together with the unqualified equality of the three. The Creed completed at Constantinople in 381 moves in the channel he cut.
Cross-References
- For the repository’s verified dogmatic anchor on the Trinity, the Cappadocian formula, and the monarchy of the Father, see The Holy Trinity.
- For the conciliar setting of 381 and its place among the councils, see The Seven Ecumenical Councils.
- For the events at Constantinople in which the Theological Orations were delivered, see Section 04 — Constantinople 381.
References
- See the collection README for the principal sources; each content file carries its own full reference list.