Incorporating the Law into the gospel presentation does many things. It primarily brings the knowledge of sin (see Rom. 7:7), showing the sinner that he is a criminal and that God is his Judge. The Law (in the hand of the Holy Spirit) stops his mouth of justification and leaves him guilty before God (see Rom. 3:19,20). It reveals that he deserves nothing but judgment for his crimes. Like a faithful prosecutor, the Law of God points its accusing finger, and so the sinner’s stirred conscience bears witness and likewise points its finger at the criminal (see Rom. 2:15). The verdict is “guilty,” and the condemnation is just. I do my best to put him in the courtroom on the Day of Judgment, with the hope that he will understand the mercy that God offers him in Christ.
Jeremiah 50:7 All who found them have devoured them; And their adversaries said, ‘We have not offended, Because they have sinned against the Lord, the habitation of justice, The Lord, tthe hope of their fathers.’