“Do we then make void the law through faith? God forbid: yea, we establish the law.” Romans 3:31 (KJB)
Since people are justified by faith without the law does that void the law? Paul says, “NO!” The law was given to show mankind his condemnation; to cause him to fall on his knees before our righteous and holy God in repentance, calling on Him by faith.
In the work of Jesus Christ on the cross the demands of the law were fulfilled, thus, by faith it is possible for a sinner to be made righteous before God; not on his own merit, but on the merit of Jesus Christ through His death, burial, and resurrection.
In Christ the holiness and righteousness of God toward sin is intact. His love for His enemies is shown. All who believe Him are declared righteous. That is an amazing salvation.
Actually the law is firmly established. All God desired is accomplished. Sinners; by God’s declaration; become saints.
When a person puts their faith in Jesus Christ the desire of their heart is to be with Him; to be like Him; to serve Him whenever and however possible. We desire to learn more about Him. We desire to be around others who love Him. We grieve over our sins and seek forgiveness quickly and diligently. We grieve over lost sinners who are condemned and pray for them, witness to them, and lead them to personal faith in Jesus. We seek to worship God with all our heart, soul, mind, and strength, and to love our neighbor as we love ourselves. That certainly sounds like the establishment/fulfillment of the law.
“Knowing that a man is not justified by the works of the law, but by the faith of Jesus Christ, even we have believed in Jesus Christ, that we might be justified by the faith of Christ, and not by the works of the law: for by the works of the law shall no flesh be justified.” Galatians 2:16