17. And first, in that which is written in Genesis, viz., that God spake with man whom He had formed out of the dust; if we set apart the figurative meaning, and treat it so as to place faith in the narrative even in the letter, it should appear that God then spake with man in the appearance of a man. This is not indeed expressly laid down in the book, but the general tenor of its reading sounds in this sense, especially in that which is written, that Adam heard the voice of the Lord God, walking in the garden in the cool of the evening, and hid himself among the trees of the garden; and when God said, “Adam, where art thou?” replied, “I heard Thy voice, and I was afraid because I was naked, and I hid myself from Thy face.” For I do not see how such a walking and conversation of God can be understood literally, except He appeared as a man. For it can neither be said that a voice only of God was framed, when God is said to have walked, or that He who was walking in a place was not visible; while Adam, too, says that he hid himself from the face of God. Who then was He? Whether the Father, or the Son, or the Holy Spirit? Whether altogether indiscriminately did God the Trinity Himself speak to man in the form of man? The context, indeed, itself of the Scripture nowhere, it should seem, indicates a change from person to person; but He seems still to speak to the first man, who said, “Let there be light,” and, “Let there be a firmament,” and so on through each of those days; whom we usually take to be God the Father, making by a word whatever He willed to make. For He made all things by His word, which Word we know, by the right rule of faith, to be His only Son. If, therefore, God the Father spake to the first man, and Himself was walking in the garden in the cool of the evening, and if it was from His face that the sinner hid himself amongst the trees of the garden, why are we not to go on to understand that it was He also who appeared to Abraham and to Moses, and to whom He would, and how He would, through the changeable and visible creature, subjected to Himself, while He Himself remains in Himself and in His own substance, in which He is unchangeable and invisible? But, possibly, it might be that the Scripture passed over in a hidden way from person to person, and while it had related that the Father said “Let there be light,” and the rest which it mentioned Him to have done by the Word, went on to indicate the Son as speaking to the first man; not unfolding this openly, but intimating it to be understood by those who could understand it.
Complete source paragraph · On the Holy Trinity, Chapter 10—Whether God the Trinity Indiscriminately Appeared to the Fathers, or Any One Person of the Trinity. The Appearing of God to Adam. Of the Same Appearance. The Vision to Abraham.; original source section: Chapter 11, source paragraph 2 · Original source