What does the Bible say about the believer's enemy?

In Ephesians 6:11, Paul identifies the devil as a significant adversary to Christians, instructing them to put on the whole armor of God specifically to withstand his wiles. This acknowledgment is critical, as it reminds believers that their struggle is not merely against human foes or external circumstances, but primarily against spiritual forces of evil. While the devil has been defeated through the cross of Christ, he continues to actively oppose believers until his ultimate defeat at the final judgment. Recognizing this reality is essential for Christians, who must remain vigilant and rely on God’s strength to resist temptation and deception, as the devil is ever-present and seeks to devour the unwary.