The Bible says that a Christian’s battle is “not against flesh and blood, but against the principalities, against the powers, against the world’s rulers of the darkness of this age, and against the spiritual forces of wickedness in the heavenly places” (Ephesians 6:12). Here are a few resources to help a believer understand how the devil works and how to be victorious through Jesus.
Insight into the devil’s strategy and schemes. By C.S. Lewis.
Breaking demonic oppression in a believer’s life. By Charles. H. Kraft
Exposition on the spiritual outfitting described in Ephesians 6. By Tony Evans.