1 John 3:10 says that the difference between God’s children and the devil’s children shows up in behavior: those who do not practice righteousness, or who do not love their brothers and sisters, do not belong to God. The apostle John wrote this to the believers he called “little children,” members of the early church who needed to know how to recognize genuine faith in a community where false teaching was spreading.
In this the children of God are revealed, and the children of the devil. Whoever doesn’t do righteousness is not of God, neither is he who doesn’t love his brother.
1 John 3:10 (WEB)
What 1 John 3:10 Means
The phrase “in this the children of God are revealed” tells us that family membership is made visible, not hidden. John is not saying that doing good earns a place in God’s family. He is saying that a real child of God will look like one, just as a child of a particular household tends to show the household’s habits, speech and character. The verse describes evidence, the kind of fruit that makes a tree’s identity plain.
The two tests John gives are practical. The first is whether someone “does righteousness,” meaning a steady pattern of living rightly before God and others. The second is whether someone loves their brother. John joins the two because, for him, a claim to know God that leaves no mark on how we treat people is not believable. The verse does not promise that a Christian will never stumble. Elsewhere in the same letter John admits that believers sin and that Christ is an advocate for them. What the verse offers is a clear standard for what a life of faith should generally look like.
The Context of 1 John 3:10
First John is a pastoral letter, traditionally attributed to the apostle John, written to Christian communities in Asia Minor near the end of the first century. Its readers were facing teachers who claimed special spiritual knowledge while living in ways that contradicted the gospel. John responds by repeatedly setting belief next to conduct, so that no one can separate knowing God from obeying and loving him.
The verses just before this one, 1 John 3:7 to 3:9, contrast the one who practices righteousness with the one who practices sin, and they connect sin to the devil and righteousness to the Son of God, who came to undo the devil’s work. Verse 10 is the conclusion of that contrast. The verses that follow, 3:11 to 3:13, press the point with the story of Cain and Abel, showing that hatred toward a brother is the same kind of evil that marked the devil’s family from the beginning. Read this way, the verse is not a random pairing of two virtues but the summary of a sustained argument about how God’s people are known.
Key Phrases in 1 John 3:10
1 John 4:20
If a man says, “I love God,” and hates his brother, he is a liar; for he who doesn’t love his brother whom he has seen, how can he love God whom he has not seen?
(WEB)
This verse sharpens the connection between love and faith by saying that anyone who claims to love God but hates a brother is a liar. It reinforces the test John gives in 3:10 and shows that love for others is inseparable from love for God.
Matthew 7:16
By their fruits you will know them. Do you gather grapes from thorns, or figs from thistles?
(WEB)
Jesus teaches that people are known by their fruit, which echoes John’s idea that character is revealed through visible conduct. Reading the two together helps show that John’s test is rooted in the teaching of Jesus himself.
A Short Prayer From 1 John 3:10
Father, you have made your family known by the way we live, and I want my life to show that I belong to you. Where I have been careless about doing what is right, forgive me and turn my habits toward your holiness. Where I have held onto anger or coldness toward my brothers and sisters, soften my heart and give me the courage to love them as you have loved me. Let my actions speak truthfully about the faith I profess, through Jesus Christ. Amen.
