Why do you disregard the whole gospel Paul preached. The law is the ministry of death and condemnation. And you dilute the blood and works of our Lord and Savior Jesus Christ. The only reason the law was given was to bring us to the end of ourselves and to Jesus himself.
This doctrine (where ever it came from) is entrusting on mans ability instead of the Holy Spirit. You pick certain laws to follow, making it seem possible to fulfill the law yet the law was never meant to be fulfilled by man but to show sin. God knew it was impossible for man to obey, but they insisted. This doctrine is not the gospel of Jesus Christ.
Let me ask you this, what if a believer disobeys a commandment?