"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