God the Word created flesh as an image of his coming in the flesh later in time

For, whatever was the form and expression which was then given to the clay (by the Creator) Christ was in His thoughts as one day to become man, because the Word, too, was to be both clay and flesh, even as the earth was then.  For so did the Father previously say to the Son: “Let us make man in our own image, after our likeness.” And God made man, that is to say, the creature which He moulded and fashioned; after the image of God (in other words, of Christ) did He make him. And the Word was God also, who being in the image of God, “thought it not robbery to be equal to God.” Thus, that clay which was even then putting on the image of Christ, who was to come in the flesh, was not only the work, but also the pledge and surety, of God.

Tertullian
On the Resurrection of the Flesh
Chapter VI

Those who deny his flesh will one day witness him in the flesh

They too who crucified Him shall see and acknowledge Him; that is to say, His very flesh, against which they spent their fury, and without which it would be impossible for Himself either to exist or to be seen; so that they must blush with shame who affirm that His flesh sits in heaven void of sensation, like a sheath only, Christ being withdrawn from it; as well as those who (maintain) that His flesh and soul are just the same thing, or else that His soul is all that exists, but that His flesh no longer lives.

Tertullian
On the Flesh of Christ
Chapter XXIV

Jesus and Christ are the same being

Surely he is antichrist who denies that Christ has come in the flesh. By declaring that His flesh is simply and absolutely true, and taken in the plain sense of its own nature, the Scripture aims a blow at all who make distinctions in it. In the same way, also, when it defines the very Christ to be but one, it shakes the fancies of those who exhibit a multiform Christ, who make Christ to be one being and Jesus another…

Tertullian
On the Flesh of Christ
Chapter XXIV

Christ could have become flesh without birth, but he didn’t

Pray, tell me, why the Spirit of God descended into a woman’s womb at all, if He did not do so for the purpose of partaking of flesh from the womb. For He could have become spiritual flesh without such a process,—much more simply, indeed, without the womb than in it. He had no reason for enclosing Himself within one, if He was to bear forth nothing from it. Not without reason, however, did He descend into a womb. Therefore He received (flesh) therefrom; else, if He received nothing therefrom, His descent into it would have been without a reason, especially if He meant to become flesh of that sort which was not derived from a womb, that is to say, a spiritual one.

Tertullian
On the Flesh of Christ
Chapter XIX

Christ is born of the Virgin without a human father

In order, therefore, that He who was already the Son of God—of God the Father’s seed, that is to say, the Spirit—might also be the Son of man, He only wanted to assume flesh, of the flesh of man without the seed of a man; for the seed of a man was unnecessary for One who had the seed of God. As, then, before His birth of the virgin, He was able to have God for His Father without a human mother, so likewise, after He was born of the virgin, He was able to have a woman for His mother without a human father. He is thus man with God, in short, since He is man’s flesh with God’s Spirit—flesh (I say) without seed from man, Spirit with seed from God. For as much, then, as the dispensation of God’s purpose concerning His Son required that He should be born of a virgin, why should He not have received of the virgin the body which He bore from the virgin?

 

Tertullian
On the Flesh of Christ
Chapter XVIII

Christ was born of a virgin as a type of Adam and Eve

Now, it will first be necessary to show what previous reason there was for the Son of God’s being born of a virgin. He who was going to consecrate a new order of birth, must Himself be born after a novel fashion, concerning which Isaiah foretold how that the Lord Himself would give the sign. What, then, is the sign? “Behold a virgin shall conceive and bear a son.” Accordingly, a virgin did conceive and bear “Emmanuel, God with us.” This is the new nativity; a man is born in God. And in this man God was born, taking the flesh of an ancient race, without the help, however, of the ancient seed, in order that He might reform it with a new seed, that is, in a spiritual manner, and cleanse it by the re-moval of all its ancient stains. But the whole of this new birth was prefigured, as was the case in all other instances, in ancient type, the Lord being born as man by a dispensation in which a virgin was the medium. The earth was still in a virgin state, reduced as yet by no human labour, with no seed as yet cast into its furrows, when, as we are told, God made man out of it into a living soul. As, then, the first Adam is thus introduced to us, it is a just inference that the second Adam likewise, as the apostle has told us, was formed by God into a quickening spirit out of the ground,—in other words, out of a flesh which was unstained as yet by any human generation. But that I may lose no opportunity of supporting my argument from the name of Adam, why is Christ called Adam by the apostle, unless it be that, as man, He was of that earthly origin? And even reason here maintains the same conclusion, because it was by just the contrary operation that God recovered His own image and likeness, of which He had been robbed by the devil. For it was while Eve was yet a virgin, that the ensnaring word had crept into her ear which was to build the edifice of death. Into a virgin’s soul, in like manner, must be introduced that Word of God which was to raise the fabric of life; so that what had been reduced to ruin by this sex, might by the selfsame sex be recovered to salvation. As Eve had believed the serpent, so Mary believed the angel. The delinquency which the one occasioned by believing, the other by believing effaced.  But (it will be said) Eve did not at the devil’s word conceive in her womb. Well, she at all events conceived; for the devil’s word afterwards became as seed to her that she should conceive as an outcast, and bring forth in sorrow.  Indeed she gave birth to a fratricidal devil; whilst Mary, on the contrary, bare one who was one day to secure salvation to Israel, His own brother after the flesh, and the murderer of Himself. God therefore sent down into the virgin’s womb His Word, as the good Brother, who should blot out the memory of the evil brother. Hence it was necessary that Christ should come forth for the salvation of man, in that condition of flesh into which man had entered ever since his condemnation.

Tertullian
On the Flesh of Christ
Chapter XVII

Christ, in the flesh, sits at the right hand of the Father in heaven

Now, even if we did assert this as our opinion, we should be able to defend it in such a way as completely to avoid the extravagant folly which he ascribes to us in making us suppose that the very flesh of Christ was in Himself abolished as being sinful; because we mention our belief (in public), that it is sitting at the right hand of the Father in heaven; and we further declare that it will come again from thence in all the pomp of the Father’s glory:

Tertullian
On the Flesh of Christ
Chapter XVI

It was God who became man to save us, not an angel

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

Christ also has a human soul

Christ, however, could not have appeared among men except as a man. Restore, therefore, to Christ, His faith; believe that He who willed to walk the earth as a man exhibited even a soul of a thoroughly human condition, not making it of flesh, but clothing it with flesh.

Tertullian
On the Flesh of Christ
Chapter XI