In Part 6 of Grace Alone, Pastor Matt shares on the difficulty of following the rules. All rules and laws, even God's laws are given because of sin. The Old Testament law was put in place for the benefit of God's people until Jesus would come.
The problem with the law is the law doesn't give life! Laws and rules cannot change hearts. The law, while it might be helpful in restraining sin, does nothing to address our desire to sin. Only Jesus can set us free from a constant striving to be good. Our identity must be found in Christ, not our good works!