J.I. Packer wrote, “When we become Christians, we find ourselves at war with the devil, for…the moment we receive God’s pardon and are taken into His family as adopted children, Satan is after us to recapture us…so we have against us an infinitely mean, smart, devious, malicious, evil, personal intelligence. What are we to do? Panic? No. We can and must put on the whole armor of God, make use of all the resources He provides, and withstand Satan whenever he attacks. Then we may hope to find ourselves standing triumphant in the field of battle with our enemy having fled.”
“Therefore put on the full armor of God, so that when the day of evil comes, you may be able to stand your ground, and after you have done everything, to stand” (Ephesians 6:13).