"But thanks be to God that though you WERE [past-tense] slaves of sin , YOU BECAME OBEDIENT FROM THE HEART TO THAT FORM OF TEACHING to which you were committed, and having been freed from sin, you became slaves of righteousness." Romans 6:17-18
"But now HAVING BEEN FREED FROM SIN and enslaved to God, you derive your benefit, RESULTING IN SANCTIFICATION [transformation], and the outcome, eternal life." Romans 6:22
Many Christians misunderstanding of the Bible leads them to Behavior Modification [trying harder or "quitting behaviors"] but that approach can't shape the soul
Now the Lord is the Spirit, and where the Spirit of the Lord is, there is freedom. And we all, with unveiled face, beholding the glory of the Lord, are being transformed into the same image from one degree of glory to another. For this comes from the Lord who is the Spirit. (2 Cor 3:17-18)