In the Book of Romans are found definitive statements concerning the transition from the Law of Moses to the grace of God in Christ.
Complete trust in the atonement made by the Lord Jesus is emphasized, and also the righteous personality and behavior that genuine trust and faith always produce.
Neither yield ye your members as instruments of unrighteousness unto sin: but yield yourselves unto God, as those that are alive from the dead, and your members as instruments of righteousness unto God. (Romans 6:13)
By entering the crucifixion and resurrection of the Lord Jesus we are removed from the legal authority of the Law of Moses and are given access to the wisdom and power of the Holy Spirit so we may be set free from the guilt and compulsion of sin.