Saint Gregory spent six years in Athens studying rhetoric, poetry, geometry, and astronomy. Saint Basil, the future Archbishop of Caesarea also studied in Athens with Saint Gregory. They were such close friends that they seemed to be one soul in two bodies. Julian, the future emperor (361-363) and apostate from the Christian Faith, was studying philosophy in Athens at the same time.

Upon completing his education, Saint Gregory remained for a certain while at Athens as a teacher of rhetoric. He was also familiar with pagan philosophy and literature.

In 358 Saint Gregory quietly left Athens and returned to his parents at Nazianzus. At thirty-three years of age, he received Baptism from his father, who had been appointed Bishop of Nazianzus. Against his will, Saint Gregory was ordained to the holy priesthood by his father. However, when the elder Gregory wished to make him a bishop, he fled to join his friend Basil in Pontus. Saint Basil had organized a monastery in Pontus and had written to Gregory inviting him to come.

Saint Gregory remained with Saint Basil for several years. When his brother Saint Caesarius died, he returned home to help his father administer his diocese. The local church was also in turmoil because of the Arian heresy. Saint Gregory had the difficult task of reconciling the bishop with his flock, who condemned their pastor for signing an ambiguous interpretation of the dogmas of the faith.

Saint Gregory convinced his father of the pernicious nature of Arianism, and strengthened him in Orthodoxy. At this time, Bishop Anthimus, who pretended to be Orthodox but was really a heretic, became Metropolitan of Tyana. Saint Basil had been consecrated as the Archbishop of Caesarea, Cappadocia. Anthimus wished to separate from Saint Basil and to divide the province of Cappadocia.

Saint Basil the Great made Saint Gregory bishop of the city of Sasima, a small town between Caesarea and Tyana. However, Saint Gregory remained at Nazianzos in order to assist his dying father, and he guided the flock of this city for a while after the death of his father in 374.

Upon the death of Patriarch Valentus of Constantinople in the year 378, a council of bishops invited Saint Gregory to help the Church of Constantinople, which at this time was ravaged by heretics. Obtaining the consent of Saint Basil the Great, Saint Gregory came to Constantinople to combat heresy. In the year 379 he began to serve and preach in a small church called “Anastasis” (“Resurrection”). Like David fighting the Philistines with a sling, Saint Gregory battled against impossible odds to defeat false doctrine.

Heretics were in the majority in the capital: Arians, Macedonians, and Appolinarians. The more he preached, the more did the number of heretics decrease, and the number of the Orthodox increased. On the night of Pascha (April 21, 379) when Saint Gregory was baptizing catechumens, a mob of armed heretics burst into the church and cast stones at the Orthodox, killing one bishop and wounding Saint Gregory. But the fortitude and mildness of the saint were his armor, and his words converted many to the Orthodox Church. Saint Gregory’s literary works (orations, letters, poems) show him as a worthy preacher of the truth of Christ. He had a literary gift, and the saint sought to offer his talent to God the Word: “I offer this gift to my God, I dedicate this gift to Him. Only this remains to me as my treasure. I gave up everything else at the command of the Spirit. I gave all that I had to obtain the pearl of great price. Only in words do I master it, as a servant of the Word. I would never intentionally wish to disdain this wealth. I esteem it, I set value by it, I am comforted by it more than others are comforted by all the treasures of the world. It is the companion of all my life, a good counselor and converser; a guide on the way to Heaven and a fervent co-ascetic.” In order to preach the Word of God properly, the saint carefully prepared and revised his works.

In five sermons, or “Theological Orations,” Saint Gregory first of all defines the characteristics of a theologian, and who may theologize. Only those who are experienced can properly reason about God, those who are successful at contemplation and, most importantly, who are pure in soul and body, and utterly selfless. To reason about God properly is possible only for one who enters into it with fervor and reverence.

The first of Saint Gregory’s Five Theological Orations is devoted to arguments against the Eunomians for their blasphemy of the Holy Spirit. Closely examining everything that is said in the Gospel about the Third Person of the Most Holy Trinity, the saint refutes the heresy of Eunomios, which rejected the divinity of the Holy Spirit. He comes to two fundamental conclusions. First, in reading Holy Scripture, it is necessary to reject blind literalism and to try and understand its spiritual sense. Second, in the Old Testament the Holy Spirit operated in a hidden way. “Now the Spirit Himself dwells among us and makes the manifestation of Himself more certain. It was not safe, as long as they did not acknowledge the divinity of the Father, to proclaim openly that of the Son; and as long as the divinity of the Son was not accepted, they could not, to express it somewhat boldly, impose on us the burden of the Holy Spirit” (Or. 31:26).

The divinity of the Holy Spirit is a sublime subject. “Look at these facts: Christ is born, the Holy Spirit is His Forerunner. Christ is baptized, the Spirit bears witness to this... Christ works miracles, the Spirit accompanies them. Christ ascends, the Spirit takes His place. What great things are there in the idea of God which are not in His power? What titles appertaining to God do not apply also to Him, except for Unbegotten and Begotten? I tremble when I think of such an abundance of titles, and how many Names they blaspheme, those who revolt against the Spirit!” (Or. 31:29).

At the Second Ecumenical Council in 381, Saint Gregory was chosen as Patriarch of Constantinople. After the death of Patriarch Meletius of Antioch, Saint Gregory presided at the Council. Hoping to reconcile the West with the East, he offered to recognize Paulinus as Patriarch of Antioch.

Upon his return to his native region, Saint Gregory turned his attention to the incursion of Appolinarian heretics into the flock of Nazianzus, and he established the pious Eulalius there as bishop, while he himself withdrew into the solitude of Arianzos so dear to his heart. The saint, zealous for the truth of Christ, continued to affirm Orthodoxy through his letters and poems, while remaining in the wilderness. He died on January 25, 389, and is honored with the title “Theologian,” also given to the holy Apostle and Evangelist John.

In his works Saint Gregory, like that other Theologian Saint John, directs everything toward the Pre-eternal Word. Saint John of Damascus (December 4), in the first part of his book An Exact Exposition of the Orthodox Faith, followed the lead of Saint Gregory the Theologian.

Saint Gregory was buried at Nazianzos. In the year 950, his holy relics were transferred to Constantinople into the church of the Holy Apostles. Later on, a portion of his relics was transferred to Rome.

In appearance, the saint was of medium height and somewhat pale. He had thick eyebrows, and a short beard. His contemporaries already called the archpastor a saint. The Orthodox Church, honors Saint Gregory as a second Theologian and insightful writer on the Holy Trinity.