Having governed the Church until 382, he delivered his farewell speech—the ''Syntacterion'', in which he demonstrated the Divinity of the Son—before 150 bishops and the Emperor [[Theodosius the Great (emperor)|Theodosius the Great]]; in this speech he requested, and received from all, permission to retire from the see of Constantinople. He returned to Nazianzus, where he lived to the end of his life, and reposed in the Lord in 391, having lived some sixty-two years.
His extant writings, both prose and poems in every type of metre, demonstrate his lofty eloquence and his wondrous breadth of learning. In the beauty of his writings, he is considered to have surpassed the Greek writers of antiquity, and because of his God-inspired theological thought, he received the surname "Theologian." Although he is sometimes called Gregory of Nazianzus, this title belongs properly to his father; he himself is known by the Church only as Gregory the Theologian. He is especially called "Trinitarian Theologian," since in virtually every homily he refers to the Trinity and the one [[Homoousios|essence]] and nature of the [[Godhead]]. Hence, Alexius Anthorus dedicated the following verses to him:
:Like an unwandering star beaming with splendour,