This Sunday at Morehead United Methodist Church, we'll be looking at the Nature and Use of the Ten Commandments. In short, the commandments exist for one reason: to make us despair of of our own righteousness. No matter how hard we try, we have all broken several if not all of the commandments. But there they are, so simple, so plain, so common sense!
When we knuckle under and realize that all our best thinking and good intentions got us to the place where Jesus had to die on the Cross to save us from our sins, then we know that there has to be a righteousness that comes from God, not from us. And we learn that this righteousness comes by faith in Jesus. It is His righteousness we need.
And when we believe in Him, repent of our sins, and turn our hearts and minds to live a godly lives, then we find that, indeed, His righteousness lives in us. And we can fully obey the Ten Commandments not because we decided to, but because Christ lives in us.
This is a mystical reality, not a mechanical process. It is by faith from first to last.