except the One who descended from heaven
This part of the verse points to the pre-existence and divine origin of Jesus Christ. It affirms the doctrine of the Incarnation, where Jesus, who is fully God, took on human flesh. The descent from heaven signifies His voluntary act of coming into the world to fulfill God's redemptive plan. This is echoed in other scriptures such as Philippians 2:6-7, which speaks of Christ's humility and incarnation. The descent also implies His authority to speak of heavenly things, as He originates from there.

the Son of Man
The title "Son of Man" is a messianic term that Jesus frequently used for Himself. It has roots in Daniel 7:13-14, where the "Son of Man" is depicted as a heavenly figure given authority and an everlasting kingdom. This title emphasizes both the humanity and the divine authority of Jesus. It connects His earthly ministry with His heavenly origin and future reign. The use of this title in this context reinforces Jesus' unique role as the mediator between God and humanity, possessing both divine insight and authority.

Which is in heaven.--These words are omitted in some MSS., including the Sinaitic and the Vatican. The judgment of most modern editors (not including Westcott and Hort) retains them. It is an instance where it is hard to account for the insertion by a copyist, but where the omission is not unlikely, owing to their seeming difficulty. And yet the difficulty is one which vanishes before the true idea of heaven. If heaven is thought of as a place infinitely distant beyond clouds and sky, or as a time in the far future when this world's life shall end, then it is indeed hard to understand what is here meant by "the Son of Man which is in heaven;" and a copyist may well have found in omission the easiest solution of the difficulty. But if heaven is something wholly different from this coldness of distance in space or time; if it is a state, a life, in which we are, which is in us--now in part, hereafter in its fulness--then may we understand and with glad hearts hold to the vital truth that the Son of Man, who came down from heaven, was ever in heaven; and that every son of man who is born of water and of the Spirit is "made a member of Christ, a child of God, and an inheritor (in the present, ??????????) of the kingdom of heaven."

(2) The truth concerning the Son of man and his sacrifice. Verse 13. - And. The simple copula is here fuller significance. Olshausen regards it as "adversative," equivalent to "yet." Meyer, as a simple continuation of the previous statement. The καὶ has more than a mere conjunctive force. Lance puts it thus: "And yet you must be told heavenly things by him who, being the Heavenly One, is himself the first subject of this revelation." No one hath ascended into heaven. The past tense must be honestly considered. The word cannot refer to the future ascension of Jesus the Lord of glory to where he was before - to the glory which he had with the Father before the world was (John 17:5); nor can it refer, as the Socinian interpreters supposed, to a rapture into heaven of the Divine Man between his baptism and temptation (Socini 'Opera,' 2:511, 610, quoted by J.P. Smith, 'Scripture Testimony to the Messiah,' 2, pp. 103-117), of which we have not the faintest trace either in Scripture or tradition; nor is it sufficient, with Hengstenberg and others, to regard it as a mere Hebraism for high and exalted intercourse with God and heavenly things. True, there have been many who have sought to climb the steep ascent (Genesis 11:4; Isaiah 14:13); true also that rabbis spoke of Moses having "ascended into the heavens," by which (says Whitby) they meant "admission to the Divine counsels." The authority on which he depends is the late 'Targum on Cantic. 1:5, 11, 12,' by which, however, all that is clear is that the Targnmist was referring to the ascent of Moses to the top of Sinai, i.e. above the multitude in the deserts, to the place whither Jehovah came to speak with him. But Exodus 20:22, the canonical Scripture, makes it clear that it was "from the heavens" that Jehovah spoke with his servant. There are, however, other passages quoted by Schottgen from Jerusalem Targum on Deuteronomy 30:12, and from the 'Mishna,' in which Moses is said to have "ascended into heaven, and heard the voice of God;" but further inquiry leads us to judge that the Hebrew commentators were thinking of the going up to Sinai for his lofty revelations, and their followers have supposed that this process was a synonym of the revelations themselves. Many have thought to rise above the world to the beatific vision, but Jesus says none have done it in the only sense in which they would have been thereby fitted to discourse on the heavenly things. Two things are needed for this in the main - to be in heaven, and come thence charged with its Divine communications. Enoch, Elijah, may have been translated that they should not see death, but they are not so lifted into the abode of God that they might come thence charged with heavenly truth, and able to explain the "how" of Divine grace. No one hath ascended into heaven except he who has by living there as in his eternal home come down from heaven. Meyer, Luthardt, Westcott, etc., all call attention to other and analogous usage of εἰ μὴ, which fastens upon a part of the previous negative, not the whole assertion, and therefore here upon the idea of living in heaven and coming thence (Matthew 12:4; Luke 4:26, 27; Galatians 1:7). Man, if he should presume to come with a full revelation of Divine and heavenly things, must come down from a height to which he had previously ascended; but no man has thus and for this purpose ascended, except he who has descended from heaven, having been there before his manifestation in the flesh, having been "in God." "with God," "in the bosom of the Father," and having come thence, not losing his essential ego, his Divine personality, even though calling himself the Son of man. For any other to have come down from heaven, it was necessary that he should first have ascended thither; but the Son of man has descended without having ascended. He calls himself "Son of man," and he claims to have come down from heaven without ceasing to be what he was before. Godet urges that, by the "ascended into heaven," he meant such lofty communion with God and immediate knowledge of Divine things as to differentiate him from all others, but that the phrase, "come down from heaven," implies previous existence in his native place, and that the Lord's filial intimacy with God rests on his essential sonship. Still, he conceives that Jesus asserts his own ascension in the spiritual sense to the heart of God, and his descent with consequent resultant knowledge, and expounds both statements by the explanation that as Son of man he is living the twofold life in heaven and on earth at the same time. By using the term, "Son of man," Christ emphasized the exalted dignity that is involved in the extent of his self-humiliation,, and complete sympathy with us. He was the second Adam, the Lord from heaven." Who is (not was) in heaven. If this be only an early gloss, it throws light on the two previous clauses. It declares that, though he came down, and though his introduction to this world was an incarnation, yet that he is in the deepest sense still in heaven. Such language is a vindication of his claim to reveal heavenly things. Augustine says, "Ecce hic erat et in coelo erat, hic erat in carne, in coelo erat divinitate, natus de matre, non recedens a Patre." Again, "Si Paulus ambulabat in carne in terra et conversabatur in coelo, Deus coeli et terrae poterat esse et in coelo et in terra." Archdeacon Watkins says admirably, "If heaven is a state, a life, in which we are, which is in us, now in part, hereafter in its fulness, then we may understand, and with glad hearts hold to, the vital truth that the Son of man who came down from heaven was ever in heaven."

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