God's Word mentions evil hundreds of times, so we cannot shrug off as a minor affair. If God treats evil as very real and present, then we must take notice.
We fight Satan by defending our ground, and we accomplish this by avoiding temptation, doing good as we are able, and overcoming the evils within.
From I Peter 2:19-24, we could make a convincing theological argument that Christian suffering is our fight against evil because we receive the slings and arrows of others and experience the most inner turmoil in the midst of our fight against evil. ...
Vanquish the sins at their point of origin—the human heart—and our deeds will be clean before God.
The best weapon against the evil of our human nature is to develop the mind of Christ within us to displace our carnal nature.
God does not just want us not to sin, He also wants us not even to appear to be doing evil. We must guard their thoughts, words and deeds at all times.
Satan is the opponent of God, of believers, and of all that is right and good. He may appear as 'an angel of light', but this is only a façade.
Satan was first named Helel, or 'son of the dawn.' When Jerome translated the Hebrew into Latin, he named him Lucifer, or light-bringer, a title of Christ!