1 Corinthians 6:18
What does 1 Corinthians 6:18 mean?
Flee sexual immorality! “Every sin that a man does is outside the body,” but he who commits sexual immorality sins against his own body.
The short answer
At first glance, 1 Corinthians 6:18 seems to make a strange claim: that every other sin happens "outside the body," while sexual sin alone is a sin "against his own body." But surely other sins touch the body too — gluttony, drunkenness, violence. So what is Paul saying?
Many readers, and many scholars, think Paul is quoting a slogan the Corinthians themselves used — the line in quotation marks may be their claim, which Paul then corrects. Either way, his point is not a medical one about which sins physically harm us. As Gordon Fee explains in his commentary, Paul's concern is the unique character of sexual sin, not a general theory of what does or doesn't affect the body. For Paul, the believer's body is not neutral territory. It is a temple of the Holy Spirit, purchased by God, and destined for resurrection — a body that is "for the Lord."
That is why sexual immorality stands apart. On Fee's reading, when a man joins himself to a prostitute, he takes a body that belongs to Christ and makes it a member of someone else's body, placing it under her mastery instead. No other sin severs and re-attaches the believer's union in quite this way. Sexual sin is uniquely a sin against the body because it turns the body's deepest belonging in the wrong direction.
Seen this way, the command to "flee" is not prudishness or panic. It is the natural response of someone who knows whose they are. Paul isn't merely forbidding something; he is protecting something — a body already claimed, already indwelt, already promised a future. The verse is less a wagging finger than a reminder of an astonishing status: your body is caught up in Christ's own life, and it matters what you do with it.
What scholars say
In this excerpt from his commentary on 1 Corinthians, Gordon Fee answers the puzzle at the heart of verse 18: if all sins involve the body somehow, why does Paul single out sexual sin as a sin against the body?
“His concern is not with what affects and does not affect the body per se, but with the special character of sexual immorality and how that sin is directed especially against the body as "for the Lord." In fornicating with a prostitute a man removes his body (which is a temple of the Spirit, purchased by God and destined for resurrection) from union with Christ and makes it a member of her body, thereby putting it under her "mastery" ( v. 12b ; cf. 7:4 ). Every other sin is apart from (i.e., not "in") the body in this singular sense.”
“Very much as in 1 Corinthians 6:12–20, although without the express language of the body as the Spirit's temple, Paul is concerned that this early, almost totally Gentile (cf. 1:9–10), congregation understand that salvation in Christ includes the sanctification of the body: it is now to be holy, and wholly for God's own purposes. ... It is of high interest that Paul concludes his prayer for them with an affirmation regarding its being realized. It has to do not so much with their effort—although he surely expects them to do their part—as with God's own faithfulness. The bottom line for Paul in all such matters is that God is completely trustworthy, not only "worthy" of our "trust," but absolutely to be relied on to carry out what has been promised.”
What it means for you
For readers today, this verse reframes how we think about our bodies and our sexuality. The question isn't only "Is this behavior allowed?" but "To whom does this body belong?" Fleeing temptation is not self-hatred or fear of the physical; it is loyalty to a relationship that already defines you. Salvation includes the body — it is meant to be holy, set apart for God's purposes, not just the soul's afterthought.
And for anyone who feels they've already failed here, Fee's broader point offers real comfort: this holiness does not finally rest on your willpower. God is faithful, and he can be relied on to complete what he has promised in you.
1 Corinthians 6 in context
In 1 Corinthians 6, Paul confronts a church confusing freedom with license. Some Corinthians apparently used the slogan "All things are lawful for me" to justify visiting prostitutes — a practice their surrounding culture treated as normal. Paul answers that the body is not disposable or irrelevant: it is "for the Lord," destined for resurrection, joined to Christ, and a temple of the Holy Spirit. Verse 18 is the sharp pivot of this argument — the command to flee — followed by the famous conclusion: you were "bought with a price," so glorify God in your body.