The Spirit himself, etc. He does not simply say, that God's Spirit is a witness to our spirit, but he adopts a compound verb, which might be rendered "contest," (contestatur,) were it not that contestation (contestatio) has a different meaning in Latin. But Paul means, that the Spirit of God gives us such a testimony, that when he is our guide and teacher, our spirit is made assured of the adoption of God: for our mind of its own self, without the preceding testimony of the Spirit, could not convey to us this assurance. There is also here an explanation of the former verse; for when the Spirit testifies to us, that we are the children of God, he at the same time pours into our hearts such confidence, that we venture to call God our Father. And doubtless, since the confidence of the heart alone opens our mouth, except the Spirit testifies to our heart respecting the paternal love of God, our tongues would be dumb, so that they could utter no prayers. For we must ever hold fast this principle, -- that we do not rightly pray to God, unless we are surely persuaded in our hearts, that he is our Father, when we so call him with our lips. To this there is a corresponding part, -- that our faith has no true evidence, except we call upon God. It is not then without reason that Paul, bringing us to this test, shows that it then only appears how truly any one believes, when they who have embraced the promise of grace, exercise themselves in prayers. [1] But there is here a striking refutation of the vain notions of the Sophists respecting moral conjecture, which is nothing else but uncertainty and anxiety of mind; nay, rather vacillation and delusion. [2] There is also an answer given here to their objection, for they ask, "How can a man fully know the will of God?" This certainly is not within the reach of man, but it is the testimony of God's Spirit; and this subject he treats more at large in the First Epistle to the Corinthians, from which we may derive a fuller explanation of a passage. Let this truth then stand sure, -- that no one can be called a son of God, who does not know himself to be such; and this is called knowledge by John, in order to set forth its certainty. (1 John 5:19, 20.)

Footnotes

1 - The words auto to pneuma, seem to mean the divine Spirit. The reference is to "the Spirit of God" in Romans 8:14; "This self-same Spirit," or, "He the Spirit," for so auto to pneuma, may be rendered, especially when the article intervenes between it and its noun. See Luke 24:15; John 16:27 Beza renders summarturei to pneumati hemon, "testifies together with our spirit -- una cum nostro spiritu," and the Vulqate "testifies to our spirit," as though the verb had not its compound; and it is said to have only the simpler meaning of testifying, though compounded, in Romans 9:1; and in Revelation 22:18, where it has a dative case after it as here, "I testify to every man," etc. The soul appears to be here called "spirit," because the renewed soul is intended, or the soul having the spirit of adoption; or it may be an instance of the Apostle's mode of writing, who often puts the same word twice in a sentence, but in a different meaning. The Holy Spirit testifies to our spirit, say Origen and Theodoret, by producing obedience, love, and imitation of God, which are evidences of our adoption; but Chrysostom and Ambrose say, by enabling us to cry Abba, Father, according to to former verse. The latter seems to be the meaning adopted by Calvin It is said by Estius, according to Poole, that the compound verb is never used without the idea of a joint-testimony being implied, and that in Revelation 22:18, it is a testimony in conjunction with Christ. Then the import of this text would be, that the Holy Spirit testifies, together with the spirit of adoption, to our spirit, to our soul or renewed mind, that we are the children of God. Thus a direct influence of the Spirit, in addition to that which is sanctifying and filial, seems to have been intended. See 2-Corinthians 1:22; Ephesians 1:13,14, 1 John 2:20, 27 Professor Hodge gives this paraphrase, -- "Not only does our filial spirit towards God prove that we are his children, but the Holy Spirit itself conveys to our souls the assurance of this delightful fact." This seems to be the full and precise import of the passage. -- Ed.

2 - "The [Roman] Catholic Church, with which all sects that proceed from Pelagian principles agree, deters from the certainty of the state of grace, and desires uncertainty towards God. Such uncertainty of hearts is then a convenient means to keep men in the leading-strings of the priesthood or ambitious founders of sects; for since they are not allowed to have any certainty themselves respecting their relation to God, they can only rest upon the judgments of their leaders about it, who thus rule souls with absolute dominion; the true evangelic doctrine makes free from such slavery to man. -- Olshausen There is no doubt much truth in these remarks; but another reason may be added: Those who know not themselves what assurance is, cannot consistently teach the doctrine; and real, genuine assurance, is an elevated state, to which man, attached to merely natural principles, can never ascend. -- Ed.

The Spirit - The Holy Spirit. That the Holy Spirit here is intended, is evident,
(1) Because this is the natural meaning of the expression;
(2) Because it is of the Holy Spirit that the apostle is mainly treating here;
(3) Because it would be an unnatural and forced construction to say of the temper of adoption that it bore witness.
Beareth witness - Testifies, gives evidence.
With our spirit - To our minds. This pertains to the adoption; and it means that the Holy Spirit furnishes evidence to our minds that we are adopted into the family of God. This effect is not infrequently attributed to the Holy Spirit, 2-Corinthians 1:22; 1-John 5:10-11; 1-Corinthians 2:12. If it be asked how this is done, I answer, it is not by any revelation of new truth; it is not by inspiration; it is not always by assurance; it is not by a mere persuasion that we are elected to eternal life; but it is by producing in us the appropriate effects of his influence. It is his to renew the heart; to sanctify the soul; to produce "love, joy, peace, long-suffering, gentleness, goodness, faith, meekness, temperance," Galatians 5:22-23. If a man has these, he has evidence of the witnessing of the Spirit with his spirit. If not, he has no such evidence. And the way, therefore, to ascertain whether we have this witnessing of the Spirit, is by an honest and prayerful inquiry whether these fruits of the Spirit actually exist in our minds. If they do, the evidence is clear. If not, all vain confidence of good estate; all visions, and raptures, and fancied revelations, will be mere delusions. It may be added, that the effect of these fruits of the Spirit an the mind is to produce a calm and heavenly frame; and in that frame, when attended with the appropriate fruits of the Spirit in a holy life, we may rejoice as an evidence of piety.
That we are the children of God - That we are adopted into his family.

The Spirit itself beareth witness with our spirit - Αυτο το πνευμα, that same Spirit, the Spirit of adoption; that is, the Spirit who witnesses this adoption; which can be no other than the Holy Ghost himself, and certainly cannot mean any disposition or affection of mind which the adopted person may feel; for such a disposition must arise from a knowledge of this adoption, and the knowledge of this adoption cannot be given by any human or earthly means; it must come from God himself: therefore the αυτο το πνευμα must have reference to that Spirit, by whom alone the knowledge of the adoption is witnessed to the soul of the believer.
With our spirit - In our understanding, the place or recipient of light and information; and the place or faculty to which such information can properly be brought. This is done that we may have the highest possible evidence of the work which God has wrought. As the window is the proper medium to let the light of the sun into our apartments, so the understanding is the proper medium of conveying the Spirit's influence to the soul. We, therefore, have the utmost evidence of the fact of our adoption which we can possibly have; we have the word and Spirit of God; and the word sealed on our spirit by the Spirit of God. And this is not a momentary influx: if we take care to walk with God, and not grieve the Holy Spirit, we shall have an abiding testimony; and while we continue faithful to our adopting Father, the Spirit that witnesses that adoption will continue to witness it; and hereby we shall know that we are of God by the Spirit which he giveth us.

The Spirit itself beareth witness,.... The thing which the Spirit of God witnesses to is,
that we are the sons of God; which supposes the case in some sense doubtful and uncertain, at least that it is called in question; not by others, though it sometimes is, as by Satan, which need not seem strange, since he called in question the sonship of Christ himself, and by the world who know them not, and by good men, till better informed: but the testimony of the Spirit is not the satisfaction of others, but the saints themselves; who are ready to doubt of it at times, because of the greatness of the favour, and their own sinfulness and unworthiness; especially after backslidings; through the temptations of the devil, and because of their many trials and afflictions. Now this witness of the Spirit is to establish and confirm it; not to make the thing itself surer, for that stands on the sure foundation of predestination, on the unalterable covenant of grace, on union to Christ; redemption by him, the gift of Christ, and continuance of the Spirit; but to assure them of it, and of their interest in it; for the testimony is given "to our spirits"; so the words are read by the Syriac, Arabic, and Ethiopic versions, and by the Vulgate Latin; which reading seems better than
with our spirits; for our own spirits are no witnesses to ourselves: the Father and Son are co-witnesses of the Spirit, but not our own spirits; the spirits of the saints are they which receive the witness of the Spirit of God, to which it is made; not to their ears, for it is not an audible testimony; but to their hearts, it is internal; to their renewed souls, where faith is wrought to receive it; to their understandings, that they may know and be assured of it; to their spirits, which are apt to faint and doubt about it. Now it is "the Spirit itself" that bears this witness, and not others, or by others, but he himself in person; who is a divine witness, whose testimony therefore must be greater than others, and a faithful one, who will never deceive; for he witnesses what he knows, and what is sure and certain: his very being and habitation in the saints are witnesses and proofs of their adoption; his powerful operations and divine landings persuade to a belief of the truth of it; and by shedding abroad the Father's love in the heart, and by the application of Gospel promises, he causes and encourages them to "cry Abba", Father; which is a wonderful instance of his condescension and grace.

The Spirit itself--It should be "Himself" (see on Romans 8:26).
beareth witness with our spirit, that we are the children--"are children"
of God--The testimony of our own spirit is borne in that cry of conscious sonship, "Abba, Father"; but we are not therein alone; for the Holy Ghost within us, yea, even in that very cry which it is His to draw forth, sets His own distinct seal to ours; and thus, "in the mouth of two witnesses" the thing is established. The apostle had before called us "sons of God," referring to our adoption; here the word changes to "children," referring to our new birth. The one expresses the dignity to which we are admitted; the other the new life which we receive. The latter is more suitable here; because a son by adoption might not be heir of the property, whereas a son by birth certainly is, and this is what the apostle is now coming to.

The same Spirit beareth witness with our spirit - With the spirit of every true believer, by a testimony distinct from that of his own spirit, or the testimony of a good conscience. Happy they who enjoy this clear and constant.