Paul told us that who we present our bodies to, becoming slaves, that is who we obey. One resulting in sin, the other, to obedience and righteousness. 

Furthermore, Paul lets us know that the law is not sin. We learn to do the right things because the law showed us the way before Christ.Finally, there will always be a conflict of two natures dwelling in us. The mind of God and my flesh waging a war.

Thanks be to God, through Jesus Christ our Lord, we win!