Romans 7:12,13

Wherefore Since then, by what has been said, it appears that the law is not the cause of sin or death, except indirectly and by accident, it must be acquitted from this charge, and acknowledged to be holy; and the commandment The preceptive part of the moral law, and every particular precept of it; is holy, just, and good It springs from and partakes of the holy nature of God; tends only to promote holiness and a conformity to God, and prescribes our duty to God in his worship and service. It is every way just and right in itself, and commands nothing but what is agreeable to those common apprehensions of right and equity which are imprinted in our natures: it is designed wholly for the good of man, 1 Timothy 1:8, and is really profitable and conducive to our good, both temporal and eternal, and subservient to the common interest of mankind. Was then that which is good made the cause of evil to me? Yea, of death, which is the greatest of evils? Was it made the proper and direct cause of death? Not so: But it was sin, which was made death to me, inasmuch as it wrought death in me, even by that which is good. Here the apostle clearly distinguishes between a proper cause and an occasion, or cause by accident. The law is the occasion of death to sinners; but sin is the proper or efficient cause of that evil. That it might appear sin Might appear superlatively vile; working death in me by that which is good By the good law: that sin by the commandment Manifesting and forbidding it, and thereby awakening and irritating it; might become exceeding sinful That, being quickened and excited by so innocent and holy a thing as the commandment, it might thereby show its horrid and vile nature; the guilt of it being hereby greatly aggravated. “Our translators suppose that αμαρτωλος [rendered sinful] is put here for the adjective. But, as Beza observes, it is used as a substantive, and signifies a sinner. For the apostle carries on the personification of sin, begun chap. Romans 6:6, by showing its exceeding sinfulness in this respect, that it makes the law, which was intended for life, the occasion of men's death.” Macknight.