If, again, he allege His own word when He said, "I and the Father are one," let him attend to the fact, and understand that He did not say, "I and the Father am one, but are one." For the word are is not said of one person, but it refers to two persons, and one power. He has Himself made this clear, when He spake to His Father concerning the disciples, "The glory which Thou gavest me I have given them; that they may be one, even as we are one: I in them, and Thou in me, that they may be made perfect in one; that the world may know that Thou hast sent me." What have the Noetians to say to these things? Are alI one body in respect of substance, or is it that we become one in the power and disposition of unity of mind? In the same manner the Son, who was sent and was not known of those who are in the world, confessed that He was in the Father in power and disposition. For the Son is the one mind of the Father. We who have the Father's mind believe so (in Him); but they who have it not have denied the Son. And if, again, they choose to allege the fact that Philip inquired about the Father, saying, "Show us the Father, and it sufficeth us," to whom the Lord made answer in these terms: "Have I been so long time with you, and yet hast thou not known me, Philip? He that hath seen me hath seen the Father. Believest thou not that I am in the Father, and the Father in me? " and if they choose to maintain that their dogma is ratified by this passage, as if He owned Himself to be the Father, let them know that it is decidedly against them, and that they are confuted by this very word. For though Christ had spoken of Himself, and showed Himself among all as the Son, they had not yet recognised Him to be such, neither had they been able to apprehend or contemplate His real power. And Philip, not having been able to receive this, as far as it was possible to see it, requested to behold the Father. To whom then the Lord said, "Philip, have I been so long time with you, and yet hast thou not known me? He that hath seen me hath seen the Father." By which He means, If thou hast seen me, thou mayest know the Father through me. For through the image, which is like (the original), the Father is made readily known. But if thou hast not known the image, which is the Son, how dost thou seek to see the Father? And that this is the case is made clear by the rest of the chapter, which signifies that the Son who "has been set forth was sent from the Father, and goeth to the Father."
And for this reason three seasons of the year prefigured the Saviour Himself, so that He should fulfil the mysteries prophesied of Him. In the Passover season, so as to exhibit Himself as one destined to be sacrificed like a sheep, and to prove Himself the true Paschal-lamb, even as the apostle says, "Even Christ," who is God, "our passover was sacrificed for us." And at Pentecost so as to presignify the kingdom of heaven as He Himself first ascended to heaven and brought man as a gift to God.
(de Trin. c. 16.) Or, His descending from heaven is the source of His origin as conceived by the Spirit: Mary gave not His body its origin, though the natural qualities of her sex contributed its birth and increase. That He is the Son of man is from the birth of the flesh which was conceived in the Virgin. That He is in heaven is from the power of His everlasting nature, which did not contract the power of the Word of God, which is infinite, within the sphere of a finite body. Our Lord remaining in the form of a servant, far from the whole circle, inner and outer, of heaven and the world, yet as Lord of heaven and the world, was not absent therefrom. So then He came down from heaven because He was the Son of man; and He was in heaven, because the Word, which was made flesh, had not ceased to be the Word.
Or, His descending from heaven is the source of His origin as conceived by the Spirit: Mary gave not His body its origin, though the natural qualities of hersex contributed its birth and increase. That He is the Son of man is from the birth of the flesh which was conceived in the Virgin. That He is in heaven is form the power of His everlasting nature, which did not contract the power of the Word of God, which is infinite, within the sphere of a finite body. Our Lord remaining in the form of a servant, far from the whole circle, inner and outer, of heaven and the world, yet as Lord of heaven and the world, was not absent therefrom. So then He came down from heaven because He was the Son of man; and He was in heaven, because the Word, which was made flesh, had not ceased to be the Word.
“Descended from heaven” refers to his origin from the Spirit. For though Mary contributed to his growth in the womb and birth all that is natural to her sex, his body did not owe to her its origin. The “Son of man” refers to the birth of the flesh conceived in the Virgin; “who is in heaven” implies the power of his eternal nature—an infinite nature, which could not restrict itself to the limits of the body—of which it was itself the source and base. By the virtue of the Spirit and the power of God the Word, though he sojourned in the form of a servant, he was ever present as Lord of all within and beyond the circle of heaven and earth. So he descended from heaven and is the Son of man, yet is in heaven. For the Word made flesh did not cease to be the Word. As the Word, he is in heaven, as flesh he is the Son of man. As Word made flesh, he is at once from heaven, and Son of man and in heaven. For the power of the Word, abiding eternally without body, was present still in the heaven he had left. The flesh owed its origin to him and to no one else. So the Word made flesh, though he was flesh, nonetheless never ceased to be the Word.
It is not possible by the laws of bodies for the same object to remain and to descend. The one is the change of downward motion, the other the stillness of being at rest. The infant wails but is in heaven: the boy grows but remains ever the immeasurable God. By what perception of human understanding can we comprehend that he ascended where he was before, and he descended who remained in heaven? The Lord says, “What if you should behold the Son of man ascending to where he was before?” The Son of man ascends where he was before. Can sense apprehend this? The Son of man—who is in heaven—descends from heaven. Can reason cope with this? The Word was made flesh—can words express this? The Word becomes flesh, that is, God becomes man. The man is in heaven: the God is from heaven. He ascends who descended, but he descends and yet does not descend. He is as he ever was, yet he was not ever what he is. We pass in review of the causes, but we cannot explain the manner. We perceive the manner but cannot understand the causes. Yet, if we understand Christ Jesus even in this way, we shall know him. If we seek to understand him further, we shall not know him at all.
Possessing both natures, that is, the human and the divine, [Christ] endured the passion in his humanity, in order that without distinction he who suffered should be called both Lord of glory and Son of man, even as it is written: “Who descended from heaven.”
(Hom. xxvii. 1) Or thus: Be not surprised at His calling Baptism earthly. It is performed upon earth, and is compared with that stupendous birth, which is of the substance of the Father, an earthly birth being one of mere grace. And well hath He said, not, Ye understand not, but, Ye believe not: for when the understanding cannot take in certain truths, we attribute it to natural deficiency or ignorance: but where that is not received which it belongs to faith only to receive, the fault is not deficiency, but unbelief. These truths, however, were revealed that posterity might believe and benefit by them, though the people of that age did not.
(Hom. xxvii. 1) Or thus: Nicodemus having said, We know that Thou art a teacher sent from God; our Lord says, And no man hath ascended, &c. in that He might not appear to be a teacher only like one of the Prophets.
(Hom. xxvii. 1) By the title Son of man here, He does not mean His flesh, but Himself altogether; the lesser part of His nature being put to express the whole. It is not uncommon with Him to name Himself wholly from His humanity, or wholly from His divinity.
(Hom xxvii. 1) That too which seemeth very lofty is still unworthy of His vastness. For He is not in heaven only, but every where, and filleth all things. But for the present He accommodates Himself to the weakness of His hearer, that by degrees He may convert him.
Since Nicodemus had said, "We know that Thou art a teacher come from God," on this very point He sets him right, all but saying, "Think Me not a teacher in such manner as were the many of the prophets who were of earth, for I have come from heaven (but) now. None of the prophets hath ascended up thither, but I dwell there." Seest thou how even that which appears very exalted is utterly unworthy of his greatness? For not in heaven only is He, but everywhere, and He fills all things; but yet He speaks according to the infirmity of His hearer, desiring to lead him up little by little. And in this place He called not the flesh "Son of Man," but He now named, so to speak, His entire Self from the inferior substance; indeed this is His wont, to call His whole Person often from His Divinity, and often from His humanity.
(De Pecc. mer. et remiss. c. xxxi) After taking notice of this lack of knowledge in a person, who, on the strength of his magisterial station, set himself above others, and blaming the unbelief of such men, our Lord says, that if such as these do not believe, others will: No one hath ascended into heaven, but He that came down from heaven, even the Son of man who is in heaven. This may be rendered: The spiritual birth shall be of such sort, as that men from being earthly shall become heavenly: which will not be possible, except they are made members of Me; so that he who ascends, becomes one with Him who descended. Our Lord accounts His body, i. e. His Church, as Himself.
(ut sup.) Although He was made the Son of man upon earth, yet His Divinity with which, remaining in heaven, He descended to earth, He hath declared not to disagree with the title of Son of man, as He hath thought His flesh worthy the name of Son of God. For through the Unity of person, by which both substances are one Christ, He walked upon earth, being Son of God; and remained in heaven, being Son of man. And the belief of the greater, involves belief in the less. If then the Divine substance, which is so far more removed from us, and could for our sake take up the substance of man so as to unite them in one person; how much more easily may we believe, that the Saints united with the man Christ, become with Him one Christ; so that while it is true of all, that they ascend by grace, it is at the same time true, that He alone ascends to heaven, Who came down from heaven.
(Tr. xii. c. 8) But thou wonderest that He was at once here, and in heaven. Yet such power hath He given to His disciples. Hear Paul, Our conversation is in heaven. (Phil. 3:20) If the man Paul walked upon earth, and had his conversation in heaven; shall not the God of heaven and earth be able to be in heaven and earth?
Some people, certainly, find very surprising what the Lord said in the Gospel, “Nobody has ascended into heaven, except the one who came down from heaven, the Son of man who is in heaven.” How, they ask, can the Son of man be said to have come down from heaven, when it was here that he was taken on in the Virgin’s womb? People who say this are not to be rejected but instructed. I think, you see, that they are raising this question out of piety but are not yet able to understand what they are inquiring about. They do not realize, I mean, that the divinity took on the humanity in such a way as to become one person, God and man; and that the humanity was attached to the divinity in such a way that Word, soul and flesh were the one Christ. And that is why it could be said, “No one has ascended into heaven, except the one who came down from heaven, the Son of man who is in heaven.”
As a human being he was on earth, not in heaven where he now is … although in his nature as Son of God he was in heaven, but as Son of man he was still on earth and had not yet ascended into heaven. In a similar way, although in his nature as Son of God he is the Lord of glory, in his nature as Son of man he was crucified.
Spiritual birth happens when human beings, being earthly, become heavenly. And this can only happen when they are made members of me. So that he may ascend who descended, since no one ascends who did not descend. Therefore everyone who needs to be changed and raised must meet together in a union with Christ so that the Christ who descended may ascend, considering his body (that is to say, his church) as nothing other than himself.
"And no man hath ascended into heaven, but He that came down from heaven, the Son of man who is in heaven." Behold, He was here, and was also in heaven; was here in His flesh, in heaven by His divinity; yea, everywhere by His divinity. Born of a mother, not quitting the Father. Two nativities of Christ are understood: one divine, the other human: one, that by which we were to be made; the other, that by which we were to be made anew: both marvellous; that without mother, this without father. But because He had taken a body of Adam, for Mary was of Adam, and was about to raise that same body again, it was an earthly thing He had said in saying, "Destroy this temple, and in three days I will raise it up." But this was a heavenly thing, when He said, "Except a man be born again of water and of the Spirit, he shall not see the kingdom of God." Come then, brethren! God has willed to be the Son of man; and willed men to be sons of God. He came down for our sakes; let us ascend for His sake. For He alone descended and ascended, He who saith, "No man hath ascended into heaven, but He who came down from heaven." Are they not therefore to ascend into heaven whom He makes sons of God? Certainly they are: this is the promise to us, "They shall be equal to the angels of God." Then how is it that no man ascends, but He that descended? Because one only descended, only one ascends. What of the rest? What are we to understand, but that they shall be His members, that one may ascend? Therefore it follows that "no man hath ascended into heaven, but He who came down from heaven, the Son of man who is in heaven." Dost thou marvel that He was both here and in heaven? Such He made His disciples. Hear the Apostle Paul saying, "But our conversation is in heaven." If the Apostle Paul, a man, walked in the flesh on earth, and yet had his conversation in heaven, was the God of heaven and earth not able to be both in heaven and on earth?
Therefore, if none but He descended and ascended, what hope is there for the rest? The hope for the rest is this, that He came down in order that in Him and with Him they might be one, who should ascend through Him. "He saith not, And to seeds," saith the apostle, "as in many; but as in one, And to thy seed, which is Christ." And to believers he saith, "And ye are Christ's; and if Christ's, then are Abraham's seed." What he said to be one, that he said that we all are. Hence, in the Psalms, many sometimes sing, to show that one is made of many; sometimes one sings, to show what is made of many. Therefore was it only one that was healed in the pool; and whoever else went down into it was not healed. Now this one shows forth the oneness of the Church. Woe to them who hate unity, and make to themselves parties among men! Let them hear him who wished to make them one, in one, for one: let them hear him who says, Be not ye making many: "I have planted, Apollos watered; but God gave the increase. But neither he that planteth is anything, neither he that watereth; but God that giveth the increase." They were saying, "I am of Paul, I of Apollos, I of Cephas." And he says, "Is Christ divided?" Be ye in one, be one thing, be one person: "No man hath ascended into heaven, but He who came down from heaven." Lo! we wish to be thine, they said to Paul. And he said to them, I will not that ye be Paul's, but be ye His whose is Paul together with you.
For no man hath ascended up to heaven but He That came down from heaven the Son of man. For since the Word of God came down from heaven, He says that the son of man came down, refusing after the Incarnation to be divided into two persons, and not suffering certain to say that the Temple taken by reason of need of the Virgin is one Son, the Word again which appeared from God the Father another: save only as regards the distinction which belongs to each by nature. For as He is the Word of God, so Man too of a woman, but One Christ of both, Undivided in regard of Sonship and God-befitting Glory. For how does He clothe as its own the Temple of the Virgin, with what befitteth the bare Word Alone: and again appropriateth to Himself what befitteth the Flesh only? For now He saith that the Son of man hath come down from heaven: but at the time of His Passion, He feareth, and is sore afraid, and very heavy, and is recorded as Himself suffering the Sufferings which befitted His Human Nature only.
(xxvii. Mor. c. 8. al. 11.) For as much as we are made one with Him, to the place from which He came alone in Himself, thither He returns alone in us; and He who is ever in heaven, daily ascendeth to heaven.
If a man of set purpose descend naked to the valley, and there providing himself with clothes and armour, ascend the mountain again, he who ascended may be said to be the same with him who descended.
But when thou hearest that the Son of man came down from heaven, think not that His flesh came down from heaven; for this is the doctrine of those heretics, who held that Christ took His Body from heaven, and only passed through the Virgin.
[AD 220] Tertullian on John 3:13