The difference between the old man and the flesh is that the old man is your former identity in Adam, which was crucified with Christ, while the flesh is an ongoing present influence that still pulls toward sin and self-reliance. The old man describes who you were; the flesh describes something a believer still has to deal with.
What Does the Bible Mean by the Old Man?
The old man is the person you were before you were joined to Christ. Paul speaks of the old man as something that has already been dealt with at the Cross.
Knowing this, that our old man is crucified with him, that the body of sin might be destroyed, that henceforth we should not serve sin. (Romans 6:6)
Notice the wording: our old man is crucified with him.
Paul doesn’t tell believers to crucify the old man little by little. He points them back to something God has already done through their identification with Christ.
The old man belongs to your former identity under sin. In Christ, that identity isn’t being repaired or restrained. It has been put off.
Lie not one to another, seeing that ye have put off the old man with his deeds; (Colossians 3:9)
That is why the old man should not be treated as another person still living inside the Christian and fighting the new man for possession.
Scripture describes it as the identity that has been put off.
Understanding that settled change is essential because otherwise every sinful impulse can make a believer wonder whether the old person somehow came back to life.
It didn’t.
What Does the Bible Mean by the Flesh?
The flesh is different.
In passages dealing with Christian living, the flesh describes the sinful pull toward living independently of God—trusting self, gratifying sinful desires, and operating from human strength rather than faith.
Paul could speak as a believer and say:
For I know that in me (that is, in my flesh,) dwelleth no good thing: for to will is present with me; but how to perform that which is good I find not. (Romans 7:18)
The presence of the flesh doesn’t mean Paul’s old identity had been restored. It means there was still something present in his earthly experience that could not produce righteousness.
Galatians makes the continuing conflict especially clear:
For the flesh lusteth against the Spirit, and the Spirit against the flesh: and these are contrary the one to the other: so that ye cannot do the things that ye would. (Galatians 5:17)
Paul is writing about a conflict experienced by believers. The flesh is therefore presented as a present reality.
But it is not presented as their identity.
Is the Flesh the Same Thing as the Old Man?
No.
Confusing the old man with the flesh creates a serious problem. If the two terms mean exactly the same thing, then Scripture would appear to say that the old man was crucified while also teaching that the old man remains active.
Paul doesn’t create that contradiction.
The old man answers the question, Who was I before Christ?
The flesh answers the question, What still pulls me toward sin and self-reliance?
One concerns identity. The other concerns the believer’s present experience.
That distinction explains how Scripture can speak of the old man as crucified while still warning Christians about the flesh.
If the Old Man Is Dead, Why Does the Flesh Still Feel So Personal?
Because the flesh operates through familiar desires, habits, reactions, and patterns of thinking.
Something can feel deeply familiar without defining who you are.
A believer may become angry in the same way he did before salvation. He may feel the same temptation, fear, pride, lust, or urge to rely on himself. Those experiences can make the old life seem very much alive.
But familiarity isn’t identity.
The presence of flesh doesn’t reverse what happened at the Cross.
This is why Paul doesn’t tell believers to discover whether their old man is really dead. He tells them how to deal with the flesh that remains present.
This I say then, Walk in the Spirit, and ye shall not fulfil the lust of the flesh. (Galatians 5:16)
The command isn’t, Make the old man die.
The old man has already been crucified.
The command concerns how the believer now walks.
Does the Flesh Become Your Old Identity Again When You Yield to It?
No. Yielding to the flesh is sin, but it doesn’t mean your former identity has been resurrected.
The distinction matters because Christians often interpret failure backward. They see what they just did and then use that behavior to decide who they must be.
Paul reasons the other direction. He begins with what God accomplished in Christ and then teaches believers how to live from that reality.
Your flesh can produce behavior that looks painfully familiar. That behavior needs to be recognized for what it is, but it doesn’t turn the old man back into your identity.
The old man describes who you were apart from Christ.
The flesh describes a present source from which you must not live.
What Should You Do With the Flesh?
Scripture doesn’t tell you to make the flesh your identity, excuse it, or trust it. Nor does it tell you to spend your life trying to crucify an old man God says has already been crucified.
The answer to the flesh is to refuse confidence in it and walk by faith in dependence on the Spirit.
For we are the circumcision, which worship God in the spirit, and rejoice in Christ Jesus, and have no confidence in the flesh. (Philippians 3:3)
That includes more than obviously sinful appetites. The flesh also wants to trust its own strength to become righteous, overcome sin, and please God.
It cannot.
Your old man isn’t waiting for you to defeat him. He was crucified with Christ.
Your flesh is still present, but it is not who you are. It is something you must not trust, follow, or allow to define you.
That is the difference between the old man and the flesh.
