Augustine of Hippo : And here he is first called the angel of the Lord and then God. Is the angel then the God of Abraham, the God of Isaac and the God of Jacob? Therefore he may be rightly understood to be the Savior himself of whom the apostle says, "Whose are the fathers, and from whom is Christ according to the flesh, who is over all things, God blessed forever." Hence even here he, who is the God blessed over all things forever, is not unreasonably understood to be himself the God of Abraham, the God of Isaac and the God of Jacob. But why was he previously called the angel of the Lord when he appeared in the flame of fire from the bush? Was it because he was one of many angels but by a dispensation represented the person of his Lord? Or was something belonging to a creature assumed which might appear visibly for the task at hand and from which words might be uttered in an audible way, whereby the presence of the Lord would also become known to the bodily senses of man, as circumstances required, by means of a creature made subject to him? For if he was one of the angels, who can readily affirm whether the person given him to announce was that of the Son, or of the Holy Spirit, or of God the Father or of the Trinity itself altogether, who is the one and only God, in order that he might say, "I am the God of Abraham, the God of Isaac and the God of Jacob"?For we cannot say that the God of Abraham, the God of Isaac and the God of Jacob is the Son of God and not the Father. Nor will anyone dare to deny that either the Holy Spirit or the Trinity itself, which we believe and understand to be the one God, is the God of Abraham, the God of Isaac and the God of Jacob. For he who is not God is not the God of those fathers. Moreover … not only the Father is God, as all, even the heretics, admit, but the Son also, which willingly or not they are forced to confess, for the apostle says, "who is, over all things, God blessed forever," and the Holy Spirit as well. The same apostle declares, "Therefore glorify God in your body," when he had previously stated, "Do you not know that your bodies are the temple of the Holy Spirit in you, whom you have from God?" And these three are one God, as the sound Catholic faith believes. It is not sufficiently clear which person in the Trinity that angel represented, assuming that he was one of the rest of the angels, and whether it was any person and not that of the Trinity itself. — THE TRINITY 2.13.23 Caesarius of Arles : It was not without reason, beloved brethren, nor without the signification of some mystery that there was a flame in the bush: "And the bush was not consumed." Indeed, the bush was a genus of thorns. What the earth has produced for sinful man cannot be put in any kind of praise, for it was first said to man when he sinned: "Thorns and thistles shall the earth bring forth to you." The fact that the bush was not burned, that is, was not seized by the flames, is understood to signify no good. In the flame is recognized the Holy Ghost; in the bush and thorns is represented the hard, haughty Jewish people. — SERMON 96.1 Clement of Alexandria : When the almighty Lord of the universe began to legislate through the Word and decided to make his power visible to Moses, he sent Moses a divine vision with the appearance of light, in the burning bush. Now a bramble bush is full of thorns. So too when the Word was concluding his legislation and his stay among men as their Lord, again he permitted himself to be crowned with thorns as a mystic symbol. Returning to the place from which he had descended, the Word renewed that by which he had first come, appearing first in the bush of thorns and later being surrounded with thorns that he might show that all was the work of the same one power. He is one, and his Father is one, the eternal beginning and end. — The Instructor Book 2 Ephrem the Syrian : The bush which was unsuitable even as an image of dead gods was able to depict within itself the mystery of the living God. Moses, this is a sign to you: as you saw God dwelling in the midst of fire, by fire must you serve the God who dwells in the fire. — COMMENTARY ON Exodus 3:2 Eusebius of Caesarea : And when an angel appears to Moses, Holy Scripture also makes it plain, saying, "The angel of the Lord appeared to him in a flame of fire in a bush." But when it refers to the actual being who replies, it calls him God and Lord and no longer an angel. It is equally clear in its distinction between the angel and the Lord in the account of what happened at the Red Sea. — PROOF OF THE GOSPEL 5.11.238 Hilary of Poitiers : And now let us enquire whether elsewhere than in the case of Hagar the Angel of God has been discovered to be God Himself. He has been so discovered, and found to be not only God, but the God of Abraham and of Isaac and of Jacob. For the Angel of the Lord appeared to Moses from the bush; and Whose voice, think you, are we to suppose was heard? The voice of Him Who was seen, or of Another? There is no room for deception; the words of Scripture are clear: And the Angel of the Lord appeared unto him in a flame of fire from a bush, and again, The Lord called unto him from the bush, Moses, Moses, and he answered, What is it? And the Lord said, Draw not nigh hither, put off thy shoes from off thy feet, for the place whereon thou standest is holy ground. And He said unto him, I am the God of Abraham, and the God of Isaac, and the God of Jacob. He who appeared in the bush speaks from the bush; the place of the vision and of the voice is one; He Who speaks is none other than He Who was seen. He Who is the Angel of God when the eye beholds Him is the Lord when the ear hears Him, and the Lord Whose voice is heard is recognised as the God of Abraham, and of Isaac, and of Jacob. When He is styled the Angel of God, the fact is revealed that He is no self-contained and solitary Being: for He is the Angel of God. When He is designated Lord and God, He receives the full title which is due to His nature and His name. You have, then, in the Angel Who appeared from the bush, Him Who is Lord and God. — ON THE TRINITY 4.32 Pacian of Barcelona : What does this mean? The vision that is said to have appeared to Moses in the desert is sometimes called an angel, sometimes the Lord. It means this: he is called angel when he served by speaking externally, and Lord, because he ruled within and produced the conditions needed for speaking. For when the speaker is ruled from within, he is called both angel because of his service and Lord because of his inspiration. Exposition of the Old and New Testament, Exodus Paterius : What does this mean? The vision that is said to have appeared to Moses in the desert is sometimes called an angel, sometimes the Lord. It means this: he is called angel when he served by speaking externally, and Lord, because he ruled within and produced the conditions needed for speaking. For when the speaker is ruled from within, he is called both angel because of his service and Lord because of his inspiration. — EXPOSITION OF THE OLD AND NEW TESTAMENT, Exodus 7 Prudentius : It was the Word, breathed from the Father's mouth, Who of the Virgin took a mortal frame. The human form that not yet in the flesh Appeared to Moses wore a brow like ours, Since God, who would by power of the Word Assume a body, made the face the same. Flames rose and seemed to burn the thorny bush. God moved amid the branches set with spines, And tresses of the flames swayed harmlessly, That he might shadow forth his Son's descent Into our thorny members sin infests With teeming briers and fills with bitter woes. For tainted at its root that noxious shrub Had sprouted from its baneful sap a crop Of evil shoots beset with many thorns. The sterile branches suddenly grew bright As God enkindled with his mighty power The leafy boughs, nor harmed the tangled briers. He touched the scarlet berries, blood-red fruits, And grazed the twigs that grew from deadly wood, Shed by the tortured bush with cruel pangs. — THE DIVINITY OF CHRIST 49-70