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The Spirit itself beareth witness.--What is the nature of this concurrent testimony? It would seem to be something of this kind. The self-consciousness of the believer assures him of his sonship. The relation in which he feels that he stands to God he knows to be that of a son. But, besides this he is aware of an eternal objective cause for this feeling. That cause is the influence of the Holy Spirit.
This passage makes it clear that the Apostle, in spite of the strongly mystic tone of his language elsewhere, never confuses the human and the divine.
8:10-17 If the Spirit be in us, Christ is in us. He dwells in the heart by faith. Grace in the soul is its new nature; the soul is alive to God, and has begun its holy happiness which shall endure for ever. The righteousness of Christ imputed, secures the soul, the better part, from death. From hence we see how much it is our duty to walk, not after the flesh, but after the Spirit. If any habitually live according to corrupt lustings, they will certainly perish in their sins, whatever they profess. And what can a worldly life present, worthy for a moment to be put against this noble prize of our high calling? Let us then, by the Spirit, endeavour more and more to mortify the flesh. Regeneration by the Holy Spirit brings a new and Divine life to the soul, though in a feeble state. And the sons of God have the Spirit to work in them the disposition of children; they have not the spirit of bondage, which the Old Testament church was under, through the darkness of that dispensation. The Spirit of adoption was not then plentifully poured out. Also it refers to that spirit of bondage, under which many saints were at their conversion. Many speak peace to themselves, to whom God does not speak peace. But those who are sanctified, have God's Spirit witnessing with their spirits, in and by his speaking peace to the soul. Though we may now seem to be losers for Christ, we shall not, we cannot, be losers by him in the end.
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.