For sin shall not have dominion over you: for you are not under the law, but under grace.
All Commentaries on Romans 6:14 Go To Romans 6
Augustine of Hippo
AD 430
This refers to the third state of man, when in his mind he serves the law of God even though his flesh still serves the law of sin. For he does not obey the desire to sin, even though lusts will continue to court him and urge him to surrender until the body is raised to new life and death is swallowed up in victory. Because we do not give in to evil desires we are under grace, and sin does not reign in our mortal bodies. But the man who is controlled by sin even if he wants to resist it is still under the law and not yet under grace.