"No one ever sins out of duty. We all sin because we want to, because our hearts long for something. If we don’t address the motivational issues behind our sin, we will only treat it superficially, adjusting our behavior, not our hearts.
Before we address fighting sin, it is worthwhile to point out that victory over sin has already been won in Christ. The good news of the gospel is that Jesus has defeated sin, death, and evil through his own death and resurrection and is making all things new, even us. Therefore, the battles we fight against sin take place within a larger war that has already been won."
Jonathan Dodson, Gospel-Centered Discipleship