In his description of the armor of God, Paul calls the Word of God “a sword of the Spirit” (Ephesians 6:17). The Bible, then, is not just a book; it is a living Word activated by the Holy Spirit. And it is a weapon to use in spiritual warfare. As the writer of Hebrews says, “The word of God is alive and active. Sharper than any double-edged sword, it penetrates even to dividing soul and spirit, joints and marrow; it judges the thoughts and attitudes of the heart” (Hebrews 4:12).

The devil is the father of lies, but the Holy Spirit is the “Spirit of truth” (see John 16:13). And when he speaks the truth through the Scripture he has inspired, the deceptions of the devil are revealed. Think about it. When Jesus himself was tempted by Satan, what weapon did he use? Scripture, of course. Every time the devil offered him something the Father did not intend for him, Jesus countered with a teaching from the Word that showed it would be wrong for him to take the bait (see Matthew 4:1-11). And the devil had to retreat! We, too, can use Scripture against the devil when we are tempted.

There is no way to overstate the power of God’s Word in the heart, mind, and life of a believer. God works in mysterious ways when we hear or read his Word. When we take time to read and meditate on Scripture daily, a supernatural wisdom is imparted into us. When we speak it to the devil, he knows he is getting nowhere with us.

Beyond that, knowing Scripture can keep us from error. As our culture drifts from its Judeo-Christian moorings, it becomes more and more important that we know and obey biblical teaching. It’s the antidote to the devil’s deceptions.

God spoke to every believer through Joshua when he said, “Do not let this Book of the Law depart from your mouth; meditate on it day and night, so that you may be careful to do everything written in it. Then you will be prosperous and successful” (Joshua 1:8).

Through the study of Scripture, God will impart within us all the wisdom and strength we need to achieve his will for us. So read Scripture. Meditate on it. And memorize it, especially verses about God’s power and his victory over the devil.