“In the beginning was the Word, and the Word was with God, and the Word was God (John 1:1ff)”.
St. Gregory of Nyssa: “The Christian Faith, which in accordance with the command of our Lord, has been preached to all nations by His disciples, is neither of men, nor by men, but by our Lord Jesus Christ Himself, Who being the Word, the Life, the Light, the Truth, and God, and Wisdom, and all else that He is by nature, was made in the likeness of man, and shared our nature, becoming like us in all things, yet without sin. He was like us in all things, in that He took upon Himself manhood in its entirety with soul and body, so that our salvation was accomplished by means of both: He appeared on earth and conversed with men, that men might no longer have opinions according to their own notions about the Self-existent [I AM], formulating into a doctrine the hints that come to them from vague conjectures, but that we might be convinced that God has truly been manifested in the flesh, and believe that to be the only true “mystery of godliness (1 Tim. 3:16).” This was delivered to us by the very Word and God, Who by Himself spoke to His Apostles, and that we might receive the teaching concerning the transcendent nature of the Deity which is given to us, as it were, “through a glass darkly (1 Cor. 13:12)” from the older Scriptures: from the Law, and the Prophets, and the Wisdom Books, as evidence of the truth fully revealed to us. We reverently accept the meaning of the things which have been spoken, so as to accord in the faith set forth by the Lord of the whole Scriptures, which faith we guard as we received it, word for word, in purity, without falsification, judging even a slight divergence from the words delivered to us an extreme blasphemy and impiety. We believe, then, as the Lord set forth the Faith to His Disciples, when He said, “Go, teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Spirit (Matt. 28:19).” This is the word of the mystery [Baptism] by which, through the new birth from above our nature is transformed from the corruptible to the incorruptible, being renewed from “the old man,” “according to the image of Him who created (Col. 3:10)” at the beginning (Gen. 1:26, 27).”
“In the Faith then which was delivered by God to the Apostles we admit neither subtraction, nor alteration, nor addition… For whatsoever is said otherwise than in exact accord with the truth is assuredly false and not true.” (St. Gregory of Nyssa (333-398 AD), Bishop of Nyssa from A.D. 372 to 376, and from 378 until his death)