Real evil is not just a concept but is embodied in a person, Satan! Satan is not alone in his fight against God, Holy Angels, Humanity, and Christians he commands countless demons to do his bidding. We as Christians are not ignorant of his methods and schemes. In these three verses, Paul exhorts his readers (and by extension Christians in the 21st century) to pick up our spiritual armor and stand firmly in the fight for truth, obedience, and abundant life in Christ.