“Was then that which is good made death unto me? God forbid. But sin, that it might appear sin, working death in me by that which is good; that sin by the commandment might become exceeding sinful.”
King James Version (KJV)
7:13 Was then that which is good made the cause of evil to me; yea, of death, which is the greatest of evil? 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 - By the good law. So that sin by the commandment became exceeding sinful - The consequence of which was, that inbred sin, thus driving furiously in spite of the commandment, became exceeding sinful; the guilt thereof being greatly aggravated.
Ro 7:13 Was that then which is good made death to me? He has just shown that the law, even though it occasions sin, is just and good. He also showed that through it sin slew him. Is the law death? Nay, far from it. It is sin, not the law, that is the source of death. Sin is so exceedingly sinful, that it seizes upon the law, that which is holy, and just, and good, to work death. It stirs up the carnal nature to rebel against the law, to break it, and hence, to pass under the condemnation of death. Thus the commandment shows forth sin as "exceeding sinful".