7:21 {13} I find then a law, that, when I would do good, evil is present with me.
(13) The conclusion: as the law of God exhorts to goodness, so does the law of sin (that is, the corruption in which we are born) force us to wickedness: but the spirit, that is, our mind, in that it is regenerated, coexists with the law of God: but the flesh, that is, the whole natural man, is bondslave to the law of sin. Therefore, in short, wickedness and death are not of the law, but of sin, which reigns in those that are not regenerated: for they neither wish to do good, neither do they do good, but they wish and do evil: but in those that are regenerated, it strives against the spirit or law of the mind, so that they cannot live at all as well as they want to, or be as free of sin as they want to.
7:21 I find then a law. It is then the law of our unregenerate state that, even if we would do good, and purpose to be better, evil will be present, and will be practiced.
7:21 I find then a law - An inward constraining power, flowing from the dictate of corrupt nature.
7:18-22 The more pure and holy the heart is, it will have the more quick feeling as to the sin that remains in it. The believer sees more of the beauty of holiness and the excellence of the law. His earnest desires to obey, increase as he grows in grace. But the whole good on which his will is fully bent, he does not do; sin ever springing up in him, through remaining corruption, he often does evil, though against the fixed determination of his will. The motions of sin within grieved the apostle. If by the striving of the flesh against the Spirit, was meant that he could not do or perform as the Spirit suggested, so also, by the effectual opposition of the Spirit, he could not do what the flesh prompted him to do. How different this case from that of those who make themselves easy with regard to the inward motions of the flesh prompting them to evil; who, against the light and warning of conscience, go on, even in outward practice, to do evil, and thus, with forethought, go on in the road to perdition! For as the believer is under grace, and his will is for the way of holiness, he sincerely delights in the law of God, and in the holiness which it demands, according to his inward man; that new man in him, which after God is created in true holiness.
