What does the Bible say about the battle against sin?

According to scripture, Christians are indeed engaged in a daily struggle against sin, as described in Romans 13:14, which instructs believers to put on the Lord Jesus Christ and make no provisions for the flesh. This acknowledges the ongoing battle against sinful desires. However, it also emphasizes the assurance that the war has already been won by Christ at the cross, where He dealt with sin once for all. This dual understanding allows believers to fight the good fight encouraged by the sure victory of the Gospel, knowing that the ultimate outcome has been secured by Jesus.