Romans 8:4

that the ordinance of the law might be fulfilled in us, who walk not after the flesh, but after the Spirit. [For what the law could not possibly do (viz.: condemn sin in the flesh, so as to destroy it and free us from it), because the flesh through which it operated was too weak, God, by sending his own Son in the likeness of sinful flesh, and for sin, did; that is to say, he condemned sin in the flesh, that justification from the law might be accomplished in us who walk not according to the flesh, but according to the Spirit. Though the law was designed to condemn and banish sin, and was in itself a perfect means of deliverance from sin and death to those who kept it, it was really, because of the sinful weakness of the human race, to which it was given, no means of deliverance at all, but a source of complete and perfect condemnation. Hence, some other deliverance became necessary. God provided this other means of salvation by sending his Son to die for man, and man's sin. That he might do this, God sent his Son to become a fleshly human being, to be incarnate in the same kind of flesh as that belonging to the rest of sinful mankind, thus fully sharing their nature. He sent him in this manner for the purpose of dying, to remove all the sin of the flesh he bore thus representatively, no matter by whom committed. Jesus, by his sinless life, lived in the flesh, as the Son of man, resisted, conquered, condemned, sentenced, and destroyed the power of sin in the flesh. Thus God sent his Son as a conqueror of sin, and as an offering for sin, that the ordinance of the law, which we fail to fulfill, might, by him who bore our flesh, and was our federal head and representative, be fulfilled in us who walk not according to the outward, fleshly nature, which lusts to do wrong, but after the inward, spiritual nature, which desires to do right.]