“Therefore, brethren, we are debtors, not to the flesh, to live after the flesh. For if ye live after the flesh, ye shall die; but if ye through the Spirit do mortify the deeds of the body, ye shall live.” Romans 8:12,13.
So then, brethren, etc. This is the conclusion of what has been previously said; for if we are to renounce the flesh, we ought not to consent to it; and if the Spirit ought to reign in us, it is inconsistent not to attend to his bidding. And this is the case, when we renounce carnal lusts, so as to devote ourselves, as those who are bound, to the righteousness of God.
For if ye will live after the flesh, etc. He adds a threatening, in order more effectually to shake off their torpor; by which also they are fully confuted who boast of justification by faith without the Spirit of Christ, though they are more than sufficiently convicted by their own conscience; for there is no confidence in God, where there is no love of righteousness. It is indeed true, that we are justified in Christ through the mercy of God alone; but it is equally true and certain, that all who are justified are called by the Lord, that they may live worthy of their vocation. Let then the faithful learn to embrace him, not only for justification, but also for sanctification, as he has been given to us for both these purposes, lest they rend him asunder by their mutilated faith.
But if ye by the Spirit, etc. He thus moderates his address, that he might not deject the minds of the godly, who are still conscious of much infirmity; for however we may as yet be exposed to sins, he nevertheless promises life to us, provided we strive to mortify the flesh: for he does not strictly require the destruction of the flesh, but only bids us to make every exertion to subdue its lusts. For whosoever are led by the Spirit of God, etc. This is a confirmation of what has immediately preceded; for he teaches us, that those only are deemed the sons of God who are ruled by his Spirit; for by this mark God acknowledges them as his own people. Thus the empty boasting of hypocrites is taken away, who without any reason assume the title; and the faithful are thus encouraged with unhesitating confidence to expect salvation. The import of the whole is this — “all those are the sons of God who are led by God’s Spirit; all the sons of God are heirs of eternal life: then all who are led by God’s Spirit ought to feel assured of eternal life. But the middle term or assumption is omitted, for it was unquestionable.
But it is right to observe, that the working of the Spirit is various: for there is that which is universal, by which all creatures are sustained and preserved; there is that also which is peculiar to men, and varying in its character: but what he means here is sanctification, with which the Lord favors none but his own elect, and by which he separates them for sons to himself.