John 3:13

(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.

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?

"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.