What does the Bible say about the battle with sin for believers?

The Christian experience is characterized by an ongoing battle with sin, even though the war has already been won by Jesus Christ. Paul acknowledges this struggle in Romans 7:24, where he refers to himself as a 'wretched man' despite being saved. The paradox here is that for believers, the war against sin was decisively won when Christ died on the cross, but the daily battle continues as we contend with our old nature. This very struggle reveals the presence of the new man within us, indicating that we are indeed saved and that the battle is a sign of spiritual life.