13. no man hath ascended, &c.—There is something paradoxical in this language—"No one has gone up but He that came down, even He who is at once both up and down." Doubtless it was intended to startle and constrain His auditor to think that there must be mysterious elements in His Person. The old Socinians, to subvert the doctrine of the pre-existence of Christ, seized upon this passage as teaching that the man Jesus was secretly caught up to heaven to receive His instructions, and then "came down from heaven" to deliver them. But the sense manifestly is this: "The perfect knowledge of God is not obtained by any man's going up from earth to heaven to receive it—no man hath so ascended—but He whose proper habitation, in His essential and eternal nature, is heaven, hath, by taking human flesh, descended as the Son of man to disclose the Father, whom He knows by immediate gaze alike in the flesh as before He assumed it, being essentially and unchangeably 'in the bosom of the Father'" (Joh 1:18).

     31-34. He that, &c.—Here is the reason why He must increase while all human teachers must decrease. The Master "cometh from above"—descending from His proper element, the region of those "heavenly things" which He came to reveal, and so, although mingling with men and things on the earth, is not "of the earth," either in Person or Word. The servants, on the contrary, springing of earth, are of the earth, and their testimony, even though divine in authority, partakes necessarily of their own earthiness. (So strongly did the Baptist feel this contrast that the last clause just repeats the first). It is impossible for a sharper line of distinction to be drawn between Christ and all human teachers, even when divinely commissioned and speaking by the power of the Holy Ghost. And who does not perceive it? The words of prophets and apostles are undeniable and most precious truth; but in the words of Christ we hear a voice as from the excellent Glory, the Eternal Word making Himself heard in our own flesh.