Sexuality & Purity

“Do you not know that your body is a temple of the Holy Spirit within you, whom you have from God? You are not your own, for you were bought with a price. So glorify God in your body.” — 1 Corinthians 6:19–20

The Bible’s teaching on sexuality begins not with prohibition but with affirmation: the human body is good, created by God, and destined for resurrection. Christian sexual ethics flow from this high view of the body and from the conviction that our bodies belong to the Lord who made and redeemed them.

Biblical Theology of the Body

Scripture affirms the goodness of the physical body from its opening pages:

• God created humanity as embodied beings and declared everything He made “very good” — tov meod (טוֹב מְאֹד) (Genesis 1:31)
• The body is not a prison for the soul (as Greek philosophy taught) but an integral part of what it means to be human. The Hebrew basar (בָּשָׂר) — “flesh, body” — is not a negative category in Scripture; it refers to the whole embodied person in their creaturely dependence on God
• The incarnation — God taking on human flesh in Christ — is the ultimate affirmation of the body’s dignity and worth
• The resurrection of the body (not escape from the body) is the Christian hope (1 Corinthians 15:42–44)

Because the body is good and sacred, what we do with our bodies matters. Sexuality is not merely physical — it engages the whole person, body and soul.

The Purpose of Sexual Union

Within the biblical vision, sexual intimacy serves multiple purposes:

• Union — The “one flesh” — basar echad (בָּשָׂר אֶחָד) — bond between husband and wife (Genesis 2:24) — a profound joining of two lives. Paul quotes this verse in 1 Corinthians 6:16, using the Greek hen soma (ἓν σῶμα) — “one body” — to show that sexual union creates a real, not merely symbolic, bond
• Procreation — Participating in God’s creative work through the bearing of children (Genesis 1:28)
• Delight — The Song of Solomon celebrates the joy and beauty of marital love without embarrassment. The Hebrew dodim (דֹּדִים) — “lovemaking, caresses” — and ahavah (אַהֲבָה) — “love” — pervade the book, presenting erotic love within covenant commitment as a gift to be savored, not a concession to weakness
• Covenant renewal — The sexual act reaffirms the exclusive, total self-giving of the marriage covenant

Scripture places sexual union within the covenant of marriage — not to diminish it, but to protect and honor it. The boundary exists because the gift is so significant.

Sexual Immorality — Porneia

The New Testament uses the Greek term porneia (πορνεία) — often translated “sexual immorality” or “fornication” — as a broad category encompassing sexual activity outside the marriage covenant. Jesus lists porneia among the sins that defile a person from within (Mark 7:21). Paul repeatedly warns against it:

• “Flee from sexual immorality” — pheugete ten porneian (φεύγετε τὴν πορνείαν) (1 Corinthians 6:18). The imperative pheugete — “flee, run away” — is a present tense command meaning “keep on fleeing,” indicating not a one-time decision but a habitual posture of active avoidance
• Porneia is listed among the “works of the flesh” contrasted with the fruit of the Spirit (Galatians 5:19–21)
• The Jerusalem council included abstention from porneia among its requirements for Gentile believers (Acts 15:29)

The historic Christian consensus, across Orthodox, Catholic, and Protestant traditions, has consistently taught that sexual intimacy is reserved for the covenant of marriage between husband and wife. This teaching is rooted not in cultural prejudice but in the biblical vision of sexuality as a covenantal gift.

The Body as Temple of the Holy Spirit

Paul’s teaching in 1 Corinthians 6:12–20 provides the theological foundation for sexual purity:

• Believers’ bodies are “members of Christ” — united to the Lord Himself (v. 15)
• Sexual sin is unique in that it is a sin “against one’s own body” (v. 18) — it violates the union that exists between the believer and Christ
• The body is a naos (ναός) — a “temple, sanctuary” — of the Holy Spirit (v. 19). This is the word for the inner sanctuary, the holy of holies — the very dwelling place of God
• “You are not your own, for you were bought with a price” (vv. 19–20) — sexual ethics are grounded in the reality of redemption. Christ purchased believers with His blood, and their bodies belong to Him

This is not a burden but a dignity. The same body that struggles with temptation is the dwelling place of the living God.

Purity of Heart

Jesus deepens the Old Testament sexual ethic by addressing the interior life. The Greek epithymeo (ἐπιθυμέω) — “to desire, to covet, to lust” — from epi (“upon”) + thymos (“passion, desire”) — describes a deliberate fixing of desire upon a forbidden object, not a fleeting temptation but a willful indulgence of the imagination:

“You have heard that it was said, ‘You shall not commit adultery.’ But I say to you that everyone who looks at a woman with lustful intent has already committed adultery with her in his heart.” — Matthew 5:27–28

Purity is not merely the absence of certain behaviors — it is a condition of the heart. Jesus calls His followers to:

• Guard the heart, for “out of the heart come evil thoughts” (Matthew 15:19)
• Pursue holiness in thought, desire, and imagination — not only in outward action
• Recognize that transformation begins within and works outward, not the other way around

The Beatitude “Blessed are the pure in heart, for they shall see God” (Matthew 5:8) — the Greek katharoi te kardia (καθαροὶ τῇ καρδίᾳ) — “clean, unmixed in heart” — echoes the Hebrew tahor (טָהוֹר) and bar levav (בַּר לֵבָב) of Psalm 24:4, “clean hands and a pure heart.” Katharos means “purified, free from contamination” — the same word used for ritually clean vessels. Purity is not an end in itself but a means to the deepest joy — knowing and seeing God.

The Historic Christian Consensus

Across the centuries and across traditions — Eastern Orthodox, Roman Catholic, and Protestant — the Church has maintained a consistent witness on core principles of sexual ethics:

• Sexual intimacy belongs within the covenant of marriage
• The human body is sacred and must be treated with dignity
• Lust, pornography, adultery, and all forms of sexual exploitation violate God’s design
• Chastity — whether in singleness or in marriage — is a Christian virtue, not an outdated relic. Paul calls believers to hagiasmos (ἁγιασμός) — “sanctification, holiness” — and specifies that “this is the will of God, your sanctification: that you abstain from sexual immorality” (1 Thessalonians 4:3). Hagiasmos — from hagios (“holy, set apart”) — frames sexual purity not as mere restraint but as being set apart for God’s sacred purposes

While Christians have disagreed on many things, this consensus has remained remarkably stable across two thousand years of Church history, grounded in the witness of Scripture and the consistent teaching of the apostolic faith.

Grace for the Broken

No section on sexuality would be complete without the gospel. The Bible’s sexual ethic is demanding — but it is set within a story of radical grace:

• The woman caught in adultery heard Jesus say, “Neither do I condemn you; go, and from now on sin no more” (John 8:11) — both mercy and call to holiness, held together
• The Samaritan woman at the well, with her complicated sexual history, became one of the first evangelists (John 4:1–42)
• Paul reminds the Corinthians — many of whom came from sexually broken backgrounds — “such were some of you. But you were washed — apelousasthe (ἀπελούσασθε) — you were sanctified — hegiasthete (ἡγιάσθητε) — you were justified — edikaioethete (ἐδικαιώθητε)” (1 Corinthians 6:11). The three verbs are in the aorist tense, pointing to a decisive, completed transformation: God’s cleansing, consecrating, and declaring-righteous is a finished work accomplished “in the name of the Lord Jesus Christ and by the Spirit of our God”
• David, who fell into adultery and murder, found forgiveness and restoration through genuine repentance (Psalm 51)

The gospel does not lower God’s standard — but it meets every person in their brokenness with the offer of forgiveness, cleansing, and new life. No one is beyond the reach of God’s redeeming love. No past is too broken for His grace. The same Christ who calls us to holiness is the Christ who died for us while we were still sinners (Romans 5:8).

Those who struggle with sexual sin — whether in the past or the present — are not disqualified from God’s family. They are precisely the people for whom Jesus came. The Church is called to be a community where truth and compassion walk together, where the standard is high and the grace is deep, and where every repentant sinner finds a home.

“Create in me a clean heart, O God, and renew a right spirit within me.” — Psalm 51:10