What did God do about the old problem of Adam?
God sent His own Son in the likeness of sinful flesh and for sin, and condemned the old Adam in the flesh. The law could not do this because it was weak through the flesh, but God took care of that old problem by sending His Son to condemn that old Adam in the flesh.
Les explains that the law of the Spirit of life in Christ Jesus has made believers free from the law of sin and death. The Mosaic Law, the Ten Commandments, could not accomplish this because it was weak through the flesh; man could not do it, but God can. So God sent His own Son in the likeness of sinful flesh and for sin to take care of that old problem of old Adam, condemning that old Adam in the flesh. This was so the righteousness of the law might be fulfilled. From God's viewpoint the law was perfect, but from the human standpoint it was weak and a yoke.
For what the law could not do, in that it was weak through the flesh, God sending his own Son in the likeness of sinful flesh, and for sin, condemned sin in the flesh: