On January 25, the Orthodox Church honors the memory of Saint Gregory the Theologian, Archbishop of Constantinople, one of the Three Holy Hierarchs and a leading Father of the fourth century. His theological legacy is directly connected with the clarification of Trinitarian faith during a period of intense doctrinal conflict: on the one hand through the celebrated Five Theological Orations, and on the other through his role in the events that led to the Second Ecumenical Council (Constantinople, 381). Although his archiepiscopal ministry was marked by disputes and ultimately by resignation, his contribution to Trinitarian theology and to the Church’s consciousness proved decisive.
The Value and Significance of the Five Theological Orations (Orations 27–31)
The Five Theological Orations (Orationes 27–31) were delivered in Constantinople, probably in the period 379–381, within the context of Gregory’s pastoral and doctrinal effort to strengthen Orthodox faith in an environment where various Arianizing tendencies prevailed, along with Eunomianism (which maintained that God’s essence is fully knowable and definable by human reason, and that the Son is inferior/unlike the Father).
Their central characteristic is the combined use of biblical exegesis, philosophical terminology, and rhetorical artistry. Gregory defends the faith of the Church in a manner that seeks precision without exhausting the mystery: theology is not merely an intellectual achievement, but a discourse that presupposes purity of life, humility, and an ecclesial mindset.
On the level of Trinitarian doctrine, Gregory formulates with particular clarity the distinction between ousia/physis (essence/nature) and hypostases/persons: one divine ousia and three hypostases, without confusion and without division. In this way both tritheism (as a fragmentation of the Godhead) and Sabellianism (as the abolition of the real distinction of Father, Son, and Spirit) are avoided. At the same time, his orations display a firm commitment to the consubstantiality (homoousios) of the Son with the Father, as already affirmed at Nicaea (325), as well as a systematic grounding of the divinity of the Holy Spirit through biblical testimony and theological argument.
Of special importance is the fact that Gregory avoids both shallow sloganizing and rigid scholasticism. His language is often poetic, yet it serves a dogmatic purpose: to show that God is truly known as person and communion, without becoming an object of “description” in a way that abolishes divine transcendence. This combination of precision and experiential tone makes the Theological Orations a foundational text of Orthodox Trinitarian theology and a point of reference for later Fathers.
His Contribution to the Second Ecumenical Council (381)
The Second Ecumenical Council was convened in Constantinople in 381 by Emperor Theodosius I, with the aim of restoring ecclesial unity and addressing doctrinal divisions that persisted after Nicaea. Gregory, as Archbishop of Constantinople, stood at the center of events and for a period presided over the Council’s proceedings.
Here careful wording is required: Saint Gregory the Theologian is often credited with “completing” the Creed, yet historically it is more accurate to say that the Second Ecumenical Council (381) ratified and consolidated the Church’s Trinitarian confession in the form associated with the so-called Nicene–Constantinopolitan Creed. Gregory the Theologian’s contribution should not be confused with that of other Fathers who also participated in the Council, such as Saint Gregory of Nyssa. The Archbishop of Constantinople contributed primarily in theological and pastoral terms: through the Theological Orations and his ministry in Constantinople he prepared the ecclesial ground for the clear confession of the divinity of the Son and of the Holy Spirit; and during the Council he played a leading role in ecclesial guidance (including, for a time, the presidency), before resigning for reasons of canonical order and ecclesial peace. In other words, his influence is reflected more in shaping the Council’s theological criterion and atmosphere than in a simple, direct attribution of the final wording of specific articles of the Creed.
At the same time, the Council also became a setting for canonical and ecclesiological tensions. Gregory’s election and transfer to the see of Constantinople were contested by a group of bishops, especially because of canonical sensitivity concerning the transfer of bishops from one see to another. Within this climate, Gregory chose resignation—an act he understood as a sacrificial concession for the sake of the Church’s peace. Even though he departed, the doctrinal direction he defended was confirmed: Trinitarian faith was articulated in a way that excluded Arianizing versions and strengthened the coherence of ecclesial teaching.
+ Metropolitan Nektarios of Hong Kong and South East Asia
