The “world” is a battleground, and the Christian life is a warfare. As Christians, we have a terrible enemy-Satan; who wants to destroy us (John 10:10a). Paul called on Christians to be “good soldiers” of the Lord Jesus Christ (2 Timothy 2:3) and “to war a good warfare” (1 Timothy 1:18). Satan and his fallen angels are spirit-beings we cannot see, but they are real enemies of every child of God (Ephesians 6:11-12). We need to study the enemy’s tactics to understand how to resist him.