1 John 1:10 Commentary: The Sharp Edge of Denying Our Sin

First John was written late in the first century, likely from Ephesus, to Christian communities in Asia Minor. The letter confronts teachers who claimed a superior knowledge of God while denying ongoing moral failure, a view scholars often connect to early Gnostic or perfectionist currents. These opponents may have said that spiritual enlightenment placed them beyond sin, or that only sins committed before baptism mattered. John’s repeated “if we say” formulas (verses 6, 8, 10) directly counter such boasts.

The Jewish background is equally significant. The Old Testament consistently teaches universal sinfulness (Psalm 130:3; Proverbs 20:9) and calls for confession (Psalm 32:5; Proverbs 28:13). John’s readers, both Jewish and Gentile Christians, would have recognized that denying sin contradicts God’s own testimony about human nature. The apostle also uses the first-person plural (“we,” “us”) throughout, this is not an attack on outsiders but a warning to the whole church, including himself. No one, not even the most mature believer, can claim to have lived without sin after conversion. The letter’s pastoral aim is clear: honest confession, not pretended perfection, keeps believers walking in the light and experiencing God’s cleansing.

The supplied commentaries and lexical data note no significant textual variants for 1 John 1:10. The verse is consistently attested in all major Greek manuscripts (e.g., Codex Sinaiticus, Codex Vaticanus, Codex Alexandrinus). The reading ψεύστην ποιοῦμεν αὐτὸν (“we make him a liar”) is stable across witnesses. No textual issues affect interpretation.

This verse has played a major role in debates about sin and perfection in Christian history. Augustine cited 1 John 1:8 and 1:10 against Pelagius, arguing that even the baptized continue to sin and must confess daily. The Council of Carthage (418 AD) condemned the idea that believers could live without sin, referencing this passage. In the Reformation, Calvin and Luther used it against Anabaptist groups who claimed entire sanctification. The verse also appears in Anglican and Lutheran liturgies for confession, especially during Lent. Modern evangelical and holiness traditions continue to wrestle with its implications: does it rule out any claim to a sinless life this side of glorification? Most streams of Christianity answer yes, while some Pentecostal and Wesleyan traditions hold that entire sanctification removes the inclination to sin, though not the possibility of committing sin, a nuance still in lively discussion.

Three-Point Outline

1. The Escalation of Denial. John shows a progression: verse 6 calls denial a lie; verse 8 calls it self-deception; verse 10 calls it making God a liar. Each step increases the severity. Denying specific acts of sin attacks God’s own testimony about humanity.
2. The Grammar of Sin. The perfect tense “have sinned” means past actions with present consequences. This verse is not about sins before conversion but about sins we commit as believers. Claiming we have not sinned since coming to faith is just as deadly as claiming we have no sin nature.
3. The Gospel Alternative. Verse 9 stands between verses 8 and 10: confession leads to forgiveness and cleansing. The antidote to denial is not moral effort but honest admission. God is faithful and righteous to forgive, that is the word we are called to believe and receive.

Five-Point Outline

1. What “We Have Not Sinned” Means. The Greek perfect (hēmartēkamen) points to specific acts, not just a sinful state. It denies any personal wrongdoing, past or present.
2. Who Is Affected. “We”, the apostle includes himself. This is a corporate warning, not an accusation against outsiders.
3. The Charge: Making God a Liar. God has declared all people sinful (Romans 3:23). To deny our sin is to call God’s word false. This is worse than deceiving ourselves; it impugns God’s character.
4. The Evidence: His Word Not in Us. “His word” (logos) refers to the message of the gospel, which presumes human sin and need for a Savior. If that word has no home in us, we have rejected the very foundation of Christianity.
5. The Cure: Return to Verse 9. Confession restores fellowship. The progression from verses 8-10 drives us back to the promise of cleansing, a rhythm the church lives by daily.

Illustration Hooks

• A marriage counselor sees a spouse who insists, “I have never done anything wrong to you,” while the other lists specific hurts. Denial blocks reconciliation. John says the same about our relationship with God.
• In a courtroom, a witness denies seeing what everyone knows happened. That witness is not just mistaken, they are lying. Denying our sin makes God’s testimony about us a lie.
• An athlete claims they have never missed a practice, but the coach has video evidence. The claim itself exposes the athlete’s disconnect from reality. John warns us not to live in that disconnect with God.

Questions Your Congregation Is Asking

• “Does this mean I have to confess every sin I ever committed, one by one?”
• “What if I honestly cannot remember a sin, does that count as denial?”
• “Is it possible to be forgiven yet still struggle with the same sin for years?”

This small-group guide focuses on the difference between verse 8 and verse 10. John warns against two related but distinct denials: that we have no sin nature (v8) and that we have not committed sinful acts (v10). Both cut us off from the cleansing that comes through confession. Read the passage aloud. Notice how “we” includes everyone, no one is exempt.

Discussion Questions

1. What does John mean by “we have no sin” in verse 8? How is that different from “we have not sinned” in verse 10?
2. Why does John call it “making God a liar” rather than just “deceiving ourselves”? What does that tell us about God’s character?
3. The Greek perfect tense (“have sinned”) suggests a condition that continues from past actions. Why is this important for understanding the verse?
4. How does the promise in verse 9 (“if we confess our sins, he is faithful and righteous to forgive”) answer both denials? What does that promise assume about us?
5. What does it mean for “his word” to be “not in us”? Can a person know Scripture but still be in this condition?
6. Some Christians think that once they are saved, they no longer “sin” in any serious way. How does this passage challenge that view?
7. How can we create church cultures where people feel safe admitting sin, rather than hiding behind claims of perfection?