There is, then, no longer but one God, but one Savior, if there be two to contrive salvation, and one of them in need of the other. But was it His object indeed to deliver man by an angel? Why, then, come down to do that which He was about to expedite with an angel’s help? If by an angel’s aid, why come Himself also? If He meant to do all by Himself, why have an angel too? He has been, it is true, called “the Angel of great counsel,” that is, a messenger, by a term expressive of official function, not of nature. For He had to announce to the world the mighty purpose of the Father, even that which ordained the restoration of man. But He is not on this account to be regarded as an angel, as a Gabriel or a Michael. For the Lord of the Vineyard sends even His Son to the laborers to require fruit, as well as His servants.
…Forasmuch, however, as it has been declared concerning the Son Himself, “Thou hast made Him a little lower than the angels” how will it appear that He put on the nature of angels if He was made lower than the angels, having become man, with flesh and soul as the Son of man? As “the Spirit of God,” however, and “the Power of the Highest,” can He be regarded as lower than the angels,—He who is verily God, and the Son of God? Well, but as bearing human nature, He is so far made inferior to the angels; but as bearing angelic nature, He to the same degree loses that inferiority. This opinion will be very suitable for Ebion, who holds Jesus to be a mere man, and nothing more than a descendant of David, and not also the Son of God; although He is, to be sure, in one respect more glorious than the prophets, inasmuch as he declares that there was an angel in Him, just as there was in Zechariah. Only it was never said by Christ, “And the angel, which spake within me, said unto me.” Neither, indeed, was ever used by Christ that familiar phrase of all the prophets, “Thus saith the Lord.” For He was Himself the Lord, who openly spake by His own authority, prefacing His words with the formula, “Verily, verily, I say unto you.” What need is there of further argument? Hear what Isaiah says in emphatic words, “It was no angel, nor deputy, but the Lord Himself who saved them.”
Tertullian
On the Flesh of Christ
Chapter XIV