Exodus 33:23

You ought to be very much ashamed of yourself on this account too, for permitting him to appear on the retired mountain in the company of Moses and Elias, whom he had come to destroy. This, to be sure, was what he wished to be understood as the meaning of that voice from heaven: “This is my beloved Son, hear Him”, Him , that is, not Moses or Elias any longer. The voice alone, therefore, was enough, without the display of Moses and Elias; for, by expressly mentioning whom they were to hear, he must have forbidden all others from being heard. …

3. But as those who uphold this heresy are sometimes accustomed to mislead the hearts of the simple by certain deceptive sophisms, I do not consider it improper to bring forward the assertions which they are in the habit of making, and to refute their deceit and falsehood. The following, then, are their declarations. It is written, that “no man hath seen God at any time.” But that God whom Moses preaches was both seen by Moses himself, and by his fathers before him; whereas He who is announced by the Saviour has never been seen at all by any one. Let us therefore ask them and ourselves whether they maintain that He whom they acknowledge to be God, and allege to be a different God from the Creator, is visible or invisible. …

28. Add, too, that which the Lord afterward said to Moses, “Thou canst not see my face: for there shall no man see my face, and live. And the Lord said, Behold, there is a place by me, and thou shall stand upon a rock: and it shall come to pass, while my glory passeth by, that I will put thee into a watch-tower of the rock, and will cover thee with my hand while I pass by: and I will take away my hand, and thou shalt see my back parts; but my face shall not be seen.”

Jacob in his flight from his brother left behind in his father’s house great riches and made his way with nothing into Mesopotamia. Moreover, to prove to us his powers of endurance, he took a stone for his pillow. Yet as he lay there he beheld a ladder set up on the earth reaching to heaven and behold the Lord stood above it, and the angels ascended and descended on it; the lesson being thus taught that the sinner must not despair of salvation nor the righteous man rest secure in his virtue. To pass over much of the story (for there is no time to explain all the points in the narrative) after twenty years he who before had passed over Jordan with his staff returned into his native land with three droves of cattle, rich in flocks and herds and richer still in children. …

III. What is this that has happened to me, O friends, and initiates, and fellow-lovers of the truth? I was running to lay hold on God, and thus I went up into the Mount, and drew aside the curtain of the Cloud, and entered away from matter and material things, and as far as I could I withdrew within myself. And then when I looked up, I scarce saw the back parts of God; although I was sheltered by the Rock, the Word that was made flesh for us. And when I looked a little closer, I saw, not the First and unmingled Nature, known to Itself, to the Trinity, I mean; not That which abideth within the first veil, and is hidden by the Cherubim; but only that Nature, which at last even reaches to us. And that is, as far as I can learn, the Majesty, or as holy David calls it, the Glory which is manifested among the creatures, which It has produced and governs. …

III. And great multitudes followed Him, and He healed them there, where the multitude was greater. If He had abode upon His own eminence, if He had not condescended to infirmity, if He had remained what He was, keeping Himself unapproachable and incomprehensible, a few perhaps would have followed Him, perhaps not even a few, possibly only Moses, and He only so far as to see with difficulty the Back Parts of God. For He penetrated the cloud, either being placed outside the weight of the body or being withdrawn from his senses; for how could he have gazed upon the subtlety, or the incorporeity, or I know not how one should call it, of God, being incorporate and using material eyes? But inasmuch as He strips Himself for us, inasmuch as He comes down (and speak of an exinanition, as it were, a laying aside and a diminution of His glory), He becomes by this comprehensible.

236. Moses is prevented from seeing the face of God; Arius merited to see it in secret. Moses and Aaron among His Priests. Moses who appeared with the Lord in glory, that Moses then saw only the back parts of God in appearance; Arius beholds God wholly face to face! But “no one,” it says, “can see My face and live.”