St. Gregory the Theologian ca. 329-389
For, amid the three infirmities in regard to theology, atheism, Judaism, and polytheism, one of which is patronised by Sabellius the Libyan, another by Arius of Alexandria, and the third by some of the ultra-orthodox among us, what is my position, can I avoid whatever in these three is noxious, and remain within the limits of piety; neither being led astray by the new analysis and synthesis into the atheism of Sabellius, to assert not so much that all are one as that each is nothing, for things which are transferred and pass into each other cease to be that which each one of them is, of that we have an unnaturally compound deity, like those mythical creatures, the subject of a picturesque imagination: nor again, by alleging a plurality of severed natures, according to the well named madness of Arius, becoming involved in a Jewish poverty, and introducing envy into the divine nature, by limiting the Godhead to the Unbegotten One alone, as if afraid that our God would perish, if He were the Father of a real God of equal nature: nor again, by arraying three principles in opposition to, or in alliance with, each other, introducing the Gentile plurality of principles from which we have escaped?
It is necessary neither to be so devoted to the Father, as to rob Him of His Fatherhood, for whose Father would He be, if the Son were separated and estranged from Him, by being ranked with the creation, (for an alien being, or one which is combined and confounded with his father, and, for the sense is the same, throws him into confusion, is not a son); nor to be so devoted to Christ, as to neglect to preserve both His Sonship, (for whose son would He be, if His origin were not referred to the Father?) and the rank of the Father as origin, inasmuch as He is the Father and Generator; for He would be the origin of petty and unworthy beings, or rather the term would be used in a petty and unworthy sense, if He were not the origin of Godhead and goodness, which are contemplated in the Son and the Spirit: the former being the Son and the Word, the latter the proceeding and indissoluble Spirit. For both the Unity of the Godhead must be preserved, and the Trinity of Persons confessed, each with His own property. (Oration 2. 37-38)
