Why will resistance cause the devil to flee? Because he knows he cannot have victory over us if we are prepared to do battle against him. As mentioned before, the Bible assures us that we need only put on the full armor of God to be fully protected from evil and to actively resist it. There is nothing more frightening to Satan than a believer who is fully equipped with spiritual armor, beginning with the “helmet of salvation,” which protects our minds, and the “breastplate of righteousness,” which protects our hearts because it is the righteousness of Christ (2 Corinthians 5:21). Only a true believer wears these because only those who have received God’s forgiveness by grace through faith have eternal salvation and the righteousness of Christ imputed to them.
Once fitted with the helmet and breastplate (literally, “chest protector”), we are then to take up other defensive weapons with which to battle Satan: truth, the readiness to proclaim the gospel, and the faith that shields us from all the flaming arrows of the evil one. The final piece of armor is prayer. We pray for strength to resist evil and to actively battle against it. We pray for wisdom in the conflict, and most of all, we remain steadfast in our prayers, both for the ability to resist the devil and also for other believers who struggle in the same battle. When the church, the body of Christ, stands united against evil, fully equipped with the armor of God, we present a formidable foe to the evil one and we will see God get the glory for the victory.
As a side note, the Bible never gives Christians the authority to “rebuke” the devil, only to resist him.Zechariah 3:2 tells us that it is the Lord who rebukes Satan. Even Michael, one of the most powerful of the angels, did not dare to accuse Satan, but rather said, “The Lord rebuke you” (Jude 1:9). In response to Satan’s attacks, Christians should redouble our efforts to clothe ourselves in the spiritual armor, wield the Word of God, and rely on His power through prayer. Instead of focusing on “rebuking” the devil, we should focus on resisting him with the full armor of God.