FIRST AND SECOND CORINTHIANS
Lesson 4: Sin in the Church
4.6 Summary
Holiness, Love, and Responsibility in the Church
1. Introduction
Lesson 4 shows that sin in the church must not be ignored or minimized. Paul addresses the Corinthians very seriously because a dangerous gap had developed between their profession of faith and their practical lives. It was especially disturbing that a serious sin was not only tolerated but apparently even justified through a false understanding of tolerance. Paul makes it clear that the church belongs to Christ and is therefore called to holiness. At the same time, the goal of biblical correction is not condemnation, but repentance, healing, and restoration. The church should be a place where truth, grace, and responsibility belong together.
2. The Biblical Foundation
Paul writes:
“It is actually reported that there is sexual immorality among you, and such sexual immorality as is not even named among the Gentiles.” 1 Corinthians 5:1
Then he reminds the church:
“A little leaven leavens the whole lump.” 1 Corinthians 5:6
Concerning the believers’ new identity, he says:
“But you were washed, but you were sanctified, but you were justified in the name of the Lord Jesus Christ and by the Spirit of our God.” 1 Corinthians 6:11
And he summarizes how believers should regard their bodies:
“For you were bought at a price; therefore glorify God in your body.” 1 Corinthians 6:20
These verses show that the church has been cleansed through Christ and should therefore reflect God’s holiness in its practical life.
3. Connection to Our Time
The church today also faces the challenge of properly combining biblical truth with loving acceptance. Our culture often emphasizes personal freedom, self-determination, and acceptance, even in areas where God’s Word sets clear boundaries. This creates the danger that sin will no longer be called by its name or that spiritual responsibility will be regarded as unloving. On the other hand, the church must never treat fallen people harshly, self-righteously, or hurtfully. Paul presents a balanced path: take sin seriously, but lead the sinner toward repentance and restoration. A church remains healthy when it stays faithful to Christ and meets people with both truth and grace.
4. Central Message of the Lesson
The church protects its identity in Christ when it does not tolerate sin, but lovingly, truthfully, and responsibly leads people toward repentance, sanctification, and restoration.
5. Theological Emphasis
The first theological emphasis of this lesson is the holiness of the church. The church is not merely a religious group, but a community of people who have been redeemed through Christ. Therefore, its life must not contradict its faith.
Paul shows that open and unrepentant sin does not affect only the individual. It influences the entire church. When a church tolerates serious sin, its spiritual thinking begins to change. What God calls sin is gradually normalized or even justified.
For this reason, Paul uses the image of leaven. A little leaven leavens the whole lump. In the same way, tolerated sin can shape an entire community. When the church fails to take a clear spiritual position, it loses its ability to discern.
The second emphasis is biblical correction. Paul calls for clear action toward the person living in sin, but his goal is not destruction. He says that the spirit may be saved. This shows that church discipline is biblical only when it is directed toward repentance and restoration.
The third emphasis is the identity of the church. Paul reminds the Corinthians that they were washed, sanctified, and justified. This new identity should determine their behavior. Christians no longer live according to the standards of their old lives, but from the new reality they have received in Christ.
The fourth emphasis concerns the handling of conflicts. Paul criticizes church members for taking their disputes before secular courts instead of resolving them in the spirit of Christ. The church should be a place where wisdom, reconciliation, and justice become visible.
The fifth emphasis is the body as the temple of the Holy Spirit. Paul shows that our bodies are not meaningless. They belong to Christ. Therefore, holiness concerns not only our thoughts and words, but also our bodies, sexuality, and relationships.
The sixth emphasis is Christian freedom. The Corinthians apparently misunderstood freedom as permission to live according to their own desires. Paul corrects this thinking. Freedom in Christ does not mean freedom to sin, but freedom from the power of sin.
The seventh emphasis concerns marriage and singleness. Both ways of life stand under the lordship of Christ. Marriage is a protected space for faithfulness, love, and sexuality. Singleness is also valuable and can make possible a life of special devotion to God.
The theological core of the entire lesson is this: Christ has not only forgiven us, but has also sanctified us. The gospel transforms our identity, our bodies, our relationships, the way we deal with conflict, and our attitude toward sin. Grace and holiness belong inseparably together.
6. Spiritual Reflection
Lesson 4 invites us to examine honestly whether our faith truly shapes our lives. It is possible to confess Christ with our lips while leaving certain areas of life outside His lordship. This very gap between faith and practice was visible in Corinth.
The same danger exists today. We can become accustomed to certain sins because they have become normal in our culture. What is constantly seen, heard, and accepted eventually appears less dangerous. For this reason, we repeatedly need the correction of God’s Word.
Paul does not call the church to self-righteousness, but to holy sorrow. This is important. When sin becomes visible, the first reaction should not be pride, gossip, or condemnation, but grief before God. A spiritual church grieves over what destroys people and dishonors God’s name.
At the same time, this sorrow must not remain passive. Love takes action. When someone lives in open sin, simply remaining silent is not love. Genuine love seeks restoration, even when the path toward it is difficult.
We must always remember that all of us live by grace. No one stands before God because of personal purity or achievement. Anyone who corrects others must also stand beneath the cross. Only then will correction take place with humility and mercy.
Especially in the area of sexuality, this lesson shows how important a clear biblical understanding is. The body does not belong to us alone, but to Christ. Our sexuality is not disconnected from our faith. It is an area in which God can either be honored or dishonored.
The thought that our body is a temple of the Holy Spirit gives us both dignity and responsibility. Our body is not cheap, accidental, or meaningless. God’s Spirit dwells within us. Therefore, our lives should be places where God’s presence becomes visible.
This applies equally to married and unmarried people. Married people are called to faithfulness, love, and mutual responsibility. Unmarried people are called to purity, dignity, and devotion to Christ. Both ways of life can honor God.
The church must be a place where these subjects are discussed honestly. Silence does not protect people from temptation. When the church does not provide biblical guidance, the culture takes over that role. Therefore, clear teaching, loving support, and practical help are needed.
The way we handle conflict also belongs to holiness. It is not enough to be biblical in matters of sexuality while acting in a worldly way in disputes, greed, pride, or unforgiveness. Paul mentions different sins together because every part of life should belong to Christ.
This lesson shows us that holiness is neither narrow nor cold. Holiness means belonging to God. It is the expression of a new identity. We live differently not because we want to save ourselves, but because Christ purchased us at a great price.
The good news remains that change is possible. The Corinthians had serious problems, but Paul reminded them that they had been washed, sanctified, and justified. God’s grace can still cleanse people, renew churches, and grant new beginnings today.
Therefore, this lesson does not end in fear, but in hope. God calls His church to truth, but also to healing. He calls us to holiness and gives us the power to live holy lives through the Holy Spirit.
7. Application in Daily Life
Practical Steps:
- Examine honestly whether your practical life agrees with your profession of faith.
- Take sin seriously without becoming self-righteous or harsh.
- Ask God for a heart that holds truth and grace together.
- Seek repentance and help if you are bound in any area of your life.
- Remind yourself daily that your body is a temple of the Holy Spirit.
- Pursue purity in marriage, singleness, relationships, and media consumption.
- Handle conflicts with humility, wisdom, and a willingness to reconcile.
- Pray for a church that acts with holiness, love, and a desire to restore.
8. Reflection Question
Where is Christ calling me or my church to take sin more seriously while also guiding people more lovingly toward restoration?
9. Closing Thought
Lesson 4 reminds us that the church belongs to Christ and is therefore called to holiness. Sin must not be tolerated because of false tolerance, for it harms both the individual and the entire community. Yet biblical correction always pursues the goal of repentance, healing, and restoration. Paul combines clear truth with spiritual responsibility and shows that our bodies, relationships, and church life should honor God. Because we have been washed, sanctified, and justified through Christ, we may also live in new purity. A church that holds grace and holiness together becomes a credible witness to the transforming power of the gospel.
“For you were bought at a price; therefore glorify God in your body.” 1 Corinthians 6:20 
Questions:
1. Many believers in Corinth showed a desire for cultural acceptance. Why is this dangerous for Christian identity? How can we avoid making the same mistake?
2. Paul’s rhetorical question, “Or do you not know that your body is the temple of the Holy Spirit?” (1 Cor. 6:19), concludes a series of seven questions in 1 Corinthians 5–6 that are introduced by the phrase “Do you not know?” (1 Cor. 5:6; 6:2–3, 9, 15–16, 19). They all require a strong affirmative answer—in the sense of, “Of course we know.” How do these questions help us understand Paul’s concern for the church? Why should we also address these subjects today?
3. Marriage comes from God (Gen. 1:27–28; 2:18–24) and must be honored (Heb. 13:4). Yet many people today regard it as outdated. How can we show the world that marriage is actually a gift from God, coming directly from the Garden of Eden?
Answers:
1. Why is the desire for cultural acceptance dangerous?
The desire for cultural acceptance is dangerous because it can cause the church to lose its identity in Christ. When Christians are more concerned with what society accepts than with what God’s Word says, their faith is gradually adapted and weakened. This is exactly what happened in Corinth: the culture shaped the thinking of the church more strongly than the gospel did. We can avoid the same mistake by regularly examining our lives in the light of God’s Word, remaining in prayer, and placing Christ above human approval. The church should love and reach people, but it must not adopt the values of the world.
2. How do the “Do you not know?” questions help us understand Paul’s concern?
The repeated questions, “Do you not know?” show that Paul was deeply concerned because the Corinthians knew the truth but were not living according to it. They already knew that sin influences the church, that they belonged to Christ, and that their bodies were temples of the Holy Spirit. Therefore, the problem was not merely a lack of knowledge, but a lack of application. Paul wanted to awaken them and remind them that their identity in Christ had consequences for their practical lives. We must also address these subjects today because knowledge alone is not enough. Our faith must become visible in the way we deal with sin, conflict, sexuality, the body, and the church.
3. How can we show that marriage is a gift from God?
We show the world the value of marriage not primarily through arguments, but through lived faithfulness, love, and mutual respect. A Christian marriage should demonstrate that God’s order is not restrictive, but protective and full of blessing. When husbands and wives forgive, serve, respect one another, and live together with God, the beauty of marriage becomes visible in practical ways. At the same time, the church should speak positively, clearly, and lovingly about marriage without looking down on people who have had different experiences. Marriage is a gift from Eden because it unites companionship, faithfulness, love, and responsibility. When Christians live out marriage in a healthy and Christ-centered way, it becomes a testimony to God’s good intention.
July 24, 2026
BELIEVE HIS PROPHETS
Daily Bible Reading: 
Job 28
True Wisdom
The greatest treasure is not gold—but the fear of the Lord
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Commentary
Summary
Message for Us Today
Thought for Reflection
The King Is Coming Soon – Hope Beyond the End
July 24 – Courage for the Truth: Standing Faithfully in Confusing Times
Key Bible Verse for the Day
Devotional for the Day
Truth Needs a Courageous Heart
Clarity Without Harshness
Steadfast Through God’s Spirit
Prayer
Thought for the Day
Personal Application
Closing Verse
