Romans 7:6 But now we are delivered from the law, that being dead wherein we were held; that we should serve in newness of spirit, and not in the oldness of the letter.
The law showed us who we were. The law brought us to death. It was in this death that we trusted Christ and He gave us new life. We now serve Christ in the newness of spirit. We do not go back to the oldness of the letter. We do not need to go back to the law. We have God Himself living in us. He guides us and directs us. He gives us the power to live out who He has made us.