The War Within — Spirit vs. Flesh

From the Series: Ordinary Saints: Lessons from the Ante-Nicene Church

Scripture quotations are from the New King James Version®. Copyright © 1982 by Thomas Nelson. Used by permission. All rights reserved.

You know exactly what you should do. The words are already forming in your mind—the sharp response that would put someone in their place. Part of you wants to say them. Perhaps they are even deserved. Then comes the check. Don’t. Be patient. Forgive. Speak with grace. For a few seconds, an entire battle seems to take place where no one else can see it. Or perhaps your struggle looks different. You know you should turn away from something, yet desire pulls you toward it. You know you should forgive, but resentment feels strangely satisfying. You intend to pray, yet almost anything suddenly seems more interesting. You want to respond humbly, but pride begins constructing its defense. Sometimes the most difficult battlefield in the Christian life is not somewhere outside us. It is within. Paul describes that conflict plainly: “For the flesh lusts against the Spirit, and the Spirit against the flesh; and these are contrary to one another” (Galatians 5:17). Those words are reassuring in one sense because Scripture does not pretend that following Christ removes temptation or makes obedience effortless. But they are also a warning. Something within fallen humanity still wants what God forbids. Paul calls it the flesh. By “flesh,” Paul does not simply mean the physical body. Scripture does not teach that the human body itself is evil.

The Christian life is not the rehabilitation of fallen human nature through religious discipline. It is life in Christ, lived through the power of the Holy Spirit. That does not make obedience passive. Walking is something we do. Throughout the New Testament, believers are commanded to flee sin, resist temptation, renew their minds, put away sinful practices, pursue righteousness, pray, remain watchful, and obey Christ. Grace does not eliminate effort. It changes its source. We no longer attempt to conquer sin as though everything depended on human willpower. God Himself is at work within His people. Paul told the Philippians: “For it is God who works in you both to will and to do for His good pleasure” (Philippians 2:13). That truth becomes particularly important after failure.

Sometimes Christians imagine that mature believers eventually reach a point where temptation becomes almost irrelevant. Then when an old desire suddenly reappears—or when anger, lust, pride, envy, fear, or selfishness rises unexpectedly—we wonder what has gone wrong. Scripture gives us a more realistic picture. The Christian has entered a genuinely new life, but the Spirit’s presence does not mean the flesh has stopped opposing Him. Galatians 5 assumes conflict. Yet it does not assume defeat. That distinction matters. Paul had already told these believers: “And those who are Christ’s have crucified the flesh with its passions and desires” (Galatians 5:24). Similarly, Romans 6 tells us that “our old man was crucified with Him” so that “we should no longer be slaves of sin” (Romans 6:6). Paul’s language is stronger than simply telling Christians to try harder against their old habits. A change of mastery has occurred. Sin may tempt us. Sin may deceive us. We may even stumble into sin. But sin no longer possesses the legitimate claim over us that it once did. Paul therefore tells believers: “Therefore do not let sin reign in your mortal body, that you should obey it in its lusts” (Romans 6:12). Notice that he does not say sin is absent. He says do not let it reign. That makes the Christian battle neither hopeless nor trivial. We are fighting an enemy whose dominion has been broken but whose desires must still be resisted.

The Christians of the Ante-Nicene centuries knew that battle well. It is easy to imagine them only in their most dramatic moments—standing before governors, refusing to deny Christ, enduring persecution, or facing martyrdom. Still, most of their Christian lives were not lived in arenas. They were lived in homes. Markets. Workshops. Marriages. Congregations. Friendships. And there, just like us, they faced the quieter temptations of ordinary human life. Their surviving writings repeatedly address anger, sexual temptation, greed, jealousy, pride, dishonesty, resentment, worldly ambition, and division among Christians. The frequency of those warnings tells us something important. The early Christians were not naturally holier human beings. They had the same fallen human tendencies we do. A second-century Christian could leave a gathering where Scripture had been read and still become angry with a spouse. A merchant who confessed Christ could still be tempted to dishonesty when money was involved. A believer could suffer persecution courageously and still wrestle with pride. A congregation could proclaim Christ faithfully and still experience jealousy or division within its own fellowship. They needed the transforming work of the Holy Spirit every bit as much as we do. And that makes their story far more useful than turning them into spiritual heroes. The battlefield has not fundamentally changed. Our circumstances have.

The flesh is remarkably adaptable. Give it first-century Rome, and it will find opportunities for sin. Give it twenty-first-century technology, and it will find new ones. Today temptation can arrive through a screen carried in our pocket. Envy can be cultivated by scrolling through carefully curated images of other people’s lives. Anger can be broadcast instantly. Lust can be privately fed. Pride can measure itself through attention and approval. Selfish ambition can even disguise itself as ministry. The tools change. The human heart does not. Neither does God’s answer. “Walk in the Spirit.” What does that look like when the battle becomes practical? Sometimes it happens in seconds. Someone insults you. The flesh immediately prepares retaliation. But the Spirit has already taught you through Scripture:” “Let no corrupt word proceed out of your mouth” (Ephesians 4:29). Now there is a choice. Someone wounds you. The flesh rehearses the offense and begins building resentment. But Scripture says, “forgiving one another, even as God in Christ forgave you” (Ephesians 4:32). Again, there is a choice. Temptation appears on a screen. The flesh says, look. But God’s Word says, “Flee sexual immorality” (1 Corinthians 6:18).

Sometimes walking by the Spirit means closing the screen. Leaving the room. Holding your tongue. Making the apology. Refusing the dishonest opportunity. Changing the conversation. Confessing the sin. Asking another believer for prayer. Doing the obedient thing before the flesh has time to negotiate. These moments can seem small. But discipleship is built from thousands of them. And something begins happening over time. Paul contrasts the works of the flesh with something entirely different: “But the fruit of the Spirit is love, joy, peace, longsuffering, kindness, goodness, faithfulness, gentleness, self-control” (Galatians 5:22–23). Fruit grows. Usually slowly. Often quietly. A person who once exploded in anger begins learning patience. Someone controlled by bitterness begins forgiving.

Prayer

Father, thank You for giving Your Spirit to those who belong to Christ. Teach me to recognize the desires of the flesh without excusing them and to walk by Your Spirit rather than relying upon my own strength. When temptation comes, bring Your Word to my remembrance and give me grace to obey quickly. When I stumble, lead me to confession and repentance rather than concealment or despair. Produce in me the fruit that only Your Spirit can grow, so that the life of Christ becomes increasingly visible in the way I think, speak, and live. In Jesus’ name, amen.