Spiritual Warfare and the Armor of God
Last updated: 2026-09-08
Spiritual warfare is the ongoing, supernatural battle in which the believer, empowered by the Holy Spirit, resists the persistent temptations of the devil, the world, and their own remaining corruption. It is not fought with worldly weapons, but by taking up the full armor of God to stand firm in the victory already secured by Jesus Christ.
The Nature of the Conflict
Spiritual warfare is not a struggle against human enemies, but a reality inherent to the Christian life. As the Apostle Paul writes, Ephesians 6:12, "For our wrestling is not against flesh and blood, but against the principalities, against the powers, against the world-rulers of this darkness, against the spiritual [hosts] of wickedness in the heavenly [places]." We are called to "put on the whole armor of God" so that we may stand against the schemes of the enemy, resting in the finished work of Christ rather than our own strength (Ephesians 6:11).
Sources Ephesians 6:11 Ephesians 6:12
The Internal Front: Mortification
A vital component of this warfare is the battle against indwelling sin. The 1689 LBCF Ch.13 §2 teaches that sanctification is imperfect in this life, leaving remnants of corruption that create a "continual and irreconcilable war." John Owen, in his classic treatise *On the Mortification of Sin in Believers*, emphasizes that mortification is not merely the suppression of sin but the constant reliance on the Spirit to keep it from dominating our lives. Because the regenerate part of the believer is strengthened by the "sanctifying Spirit of Christ," we are enabled to overcome and grow in grace (1689 LBCF Ch.13 §3).
Sources 1689 LBCF Ch.13 §2 1689 LBCF Ch.13 §3
The Source of Victory
The gospel is the A to Z of our warfare; we do not fight *for* victory, but *from* the victory of Christ. The saints "conquered him by the blood of the Lamb" (Revelation 12:11). Our primary weapon is the "sword of the Spirit, which is the word of God" (Ephesians 6:17), and our posture is one of constant prayer in the Spirit. As we recognize our own flaws, we find that our security in Christ provides the strength necessary to resist sin.
Sources Revelation 12:11 Ephesians 6:17
Applying the armor of God means daily putting on the finished righteousness of Christ by faith, resting in the gospel, and prayerfully relying on the Spirit to resist sin and the devil's lies. It is an act of standing firm in a victory that Christ has already won for you, rather than an attempt to earn his favor.
Putting on the Armor of Christ
In daily life, the 'armor of God' is the practical, gospel-centered outworking of our union with Jesus. When we are tempted, we 'gird our loins with truth' by grounding ourselves in the promises of God against the lies of the enemy. We put on the 'breastplate of righteousness' not by looking at our own shaky works, but by trusting in the perfect righteousness of Christ, which alone protects us from the accusation of the devil. As the Apostle Paul reminds us, the primary goal of this armor is to stand firm in the gospel peace we have already been granted: Ephesians 6:13-17.
Sources Ephesians 6:13-17
Prayer and the Sword of the Spirit
Daily Christian life is marked by a constant, prayerful reliance on Scripture. The only offensive weapon given to us is the 'sword of the Spirit,' which is the Word of God. We apply this by saturating our minds with the Bible, using it to parry the fiery darts of doubt and despair. As we see in Ephesians 6:17-18, this is paired with praying at all seasons in the Spirit. This reveals that our victory is never by our own strength but through the power of God who sustains us, mirroring the perspective of the Heidelberg Catechism Q.127, which teaches that we must rely on the Spirit because we are weak in ourselves.
Sources Ephesians 6:17-18 Heidelberg Catechism Q.127
Victory in the Gospel
It is vital to remember that we do not fight for victory, but *from* victory. Because Christ has already conquered the principalities and powers through his death and resurrection, as described in Ephesians 1:20-22, our battle is simply to stand in the freedom he purchased. Acknowledging our profound sinfulness necessitates the armor, while resting in the extent of Christ’s love provides the confidence to stand firm. Be strong in the Lord, as urged in Ephesians 6:10, not by your own willpower, but by the strength of his might.
Sources Ephesians 1:20-22 Ephesians 6:10
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