For he whom God hath sent speaketh the words of God. He confirms the preceding statement, for he shows that we have actually to do with God, when we receive the doctrine of Christ; because Christ proceeded from none else than from the Heavenly Father. It is, therefore, God alone who speaks to us by him; and, indeed, we do not assign to the doctrine of Christ all that it deserves, unless we acknowledge it to be divine. For God giveth not the Spirit by measure. This passage is explained in two ways. Some extend it to the ordinary dispensation in this manner: that God, who is the inexhaustible fountain of all benefits, does not in the least degree diminish his resources, when he largely and plentifully bestows his gifts on men. They who draw from any vessel what they give to others come at last to the bottom; but there is no danger that any thing of this sort can happen with God, nor will the abundance of his gifts ever be so large that he cannot go beyond it, whenever he shall be pleased to make a new exercise of liberality. This exposition appears to have some plausibility, for the sentence is indefinite; that is, it does not expressly point out any person. [1] But I am more disposed to follow Augustine, who explains that it was said concerning Christ. Nor is there any force in the objection, that no express mention is made of Christ in this clause, since all ambiguity is removed by the next clause, in which that which might seem to have been said indiscriminately about many is limited to Christ. For these words were unquestionably added for the sake of explanation, that the Father hath given all things into the hand of his Son, because he loveth him, and ought therefore to be read as placed in immediate connection. The verb in the present tense -- giveth -- denotes, as it were, a continued act; for though Christ was all at once endued with the Spirit in the highest perfection, yet, as he continually flows, as it were, from a source, and is widely diffused, there is no impropriety in saying that Christ now receives him from the Father. But if any one choose to interpret it more simply, it is no unusual thing that there should be a change of tenses in such verbs, and that giveth should be put for hath given [2] The meaning is now plain, that the Spirit was not given to Christ by measure, as if the power of grace which he possesses were in any way limited; as Paul teaches that to every one is given according to the measure of the gift, (Ephesians 4:7,) so that there is no one who alone has full abundance. For while this is the mutual bond of brotherly intercourse between us, that no man separately considered has every thing that he needs, but all require the aid of each other, Christ differs from us in this respect, that the Father has poured out upon him an unlimited abundance of his Spirit. And, certainly, it is proper that the Spirit should dwell without measure in him, that we may all draw out of his fullness, as we have seen in the first chapter. And to this relates what immediately follows, that the Father hath given all things into his hand; for by these words John the Baptist not only declares the excellence of Christ, but, at the same time, points out the end and use of the riches with which he is endued; namely, that Christ, having been appointed by the Father to be the administrator, he distributes to every one as he chooses, and as he finds to be necessary; as Paul explains more fully in the fourth chapter of the Epistle to the Ephesians, which I lately quoted. Although God enriches his own people in a variety of ways, this is peculiar to Christ alone, that he has all things in his hand

Footnotes

1 - "C'est a dire, ne determine point certaine personne."

2 - "Et que Donne soit mis pour et donne."

Whom God hath sent - The Messiah.
Speaketh the words of God - The truth, or commands of God.
For God giveth not the Spirit - The Spirit of God. Though Jesus was God as well as man, yet, as Mediator, God anointed him, or endowed him with the influences of his Spirit, so as to be completely qualified for his great work.
By measure - Not in a small degree, but fully, completely. The prophets were inspired on particular occasions to deliver special messages. The Messiah was continually filled with the Spirit of God. "The Spirit dwelt in him, not as a vessel, but as in a fountain, as in a bottomless ocean (Henry).

For God giveth not the Spirit by measure - He is the most perfect of all teachers, as having received the Holy Spirit as none before him ever did. Without measure - not for a particular time, people, purpose, etc., but for the whole compass of time, and in reference to all eternity. Former dispensations of the Holy Spirit made partial discoveries of infinite justice and mercy; but now the sum of justice, in requiring such a sacrifice, and the plenitude of mercy, in providing it, shall, by that Spirit with which he baptizes, be made manifest to all the children of men. It is worthy of remark that this was fully done after the outpouring of the Spirit on the day of pentecost, Acts 2:1, etc., as may be clearly seen in all the apostolic epistles. The Jews observe, that the Holy Spirit was given only in certain measures to the prophets; some writing only one book, others two. So Rab. Acba.

For he whom God hath sent,.... Still meaning Christ, who was sent in human nature, in the likeness of sinful flesh, in the fulness of time; to be the Saviour of the world, of that which was lost, of the chief of sinners; and to preach the glad tidings of the Gospel, which is more especially here designed; and for which he was abundantly qualified by the Spirit of God, with which he was anointed:
speaketh the words of God; the words which God gave unto him; the doctrines of grace; the word of truth; the word of faith; the word of righteousness; the word of reconciliation; the words of salvation and eternal life; the whole mind and will of God; and whatever he spoke were as true as the oracles of God, and were such.
For God giveth not the Spirit by measure unto him, as he did to the prophets of the Old Testament, and to the apostles of the New; and to the ordinary ministers of the word, who have gifts differing one from another; to one is given one gift of the Spirit; and to another, another gift, as the Spirit pleaseth; and to everyone is given grace, or gifts of grace, according to the measure of the gift of Christ, Ephesians 4:7. To which agrees what the Jews say (a) of the Holy Spirit, and his gifts.
"Says R. Joden bar R. Simeon, even the waters which descend from above are not given, but, "in measure".--Says R. Acha, even the Holy Spirit, which dwells upon the prophets, does not dwell, but "in weight".''
But the Lord Jesus has every, gift of the Spirit, and the fulness of grace in him: he is anointed with the oil of gladness, with the Holy Ghost above his fellows; and has an immeasurable unction of the holy one; which, like the precious oil poured on Aaron, descends from him to the members of his body.
(a) Vajikra Rabba, sect. 15. fol. 157. 3.

for God giveth not the Spirit by measure--Here, again, the sharpest conceivable line of distinction is drawn between Christ and all human-inspired teachers: "They have the Spirit in a limited degree; but God giveth not [to Him] the Spirit by measure." It means the entire fulness of divine life and divine power. The present tense "giveth," very aptly points out the permanent communication of the Spirit by the Father to the Son, so that a constant flow and reflow of living power is to be understood (Compare John 1:15) [OLSHAUSEN].

God giveth not him the Spirit by measure - As he did to the prophets, but immeasurably. Hence he speaketh the words of God in the most perfect manner.