First John 3:10 teaches that the people who belong to God can be recognized by how they live, especially by doing what is right and by loving other believers. Someone who consistently refuses to do righteousness, or who does not love their brother or sister, shows that they are not living as a child of God. The verse is written by the apostle John, traditionally identified as the disciple who wrote the Gospel and the three letters that bear his name, to a community of early Christians facing confusion about who truly belonged to God.
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 verse opens by saying that the “children of God” and the “children of the devil” are made visible, or revealed, by their conduct. John is not describing a hidden inner status that only God can see. He is saying that a person’s life makes their true allegiance plain to others and to themselves. The word “revealed” points to something that becomes clear over time, the way a tree shows its roots by the fruit it bears.
The second half gives two tests. The first is whether a person “does righteousness.” This means a settled pattern of doing what is right, not a single good deed. The second is whether a person loves their brother. John joins these two tests together, so that in his view a life of justice and a life of love for fellow believers go hand in hand. The verse does not promise that a believer will never fail, since John writes elsewhere about confessing sin. What it does is describe the direction a life is moving in and warn against assuming that a claimed faith is enough without visible change.
The Context of 1 John 3:10
First John is a pastoral letter, most likely written near the end of the first century to churches in the region of Asia Minor. Its tone is warm and direct, and its author repeatedly calls his readers “little children” and “beloved.” Some members of the community had apparently left, and John wrote to help those who remained understand what genuine faith looks like and to guard them against teachers who were leading them astray.
The verses just before this one contrast the child of God with the one who sins, and the verses just after present Cain as an example of hatred toward a brother. That surrounding material shows that John is thinking about a pattern of life rather than perfection. Read in that setting, verse 10 becomes a clear summary: the difference between God’s family and the devil’s is seen in righteousness and in love, and both can be tested in ordinary relationships.
Key Phrases in 1 John 3:10
1 John 3:14
We know that we have passed out of death into life, because we love the brothers. He who doesn’t love his brother remains in death.
(WEB)
This verse continues the theme of love for fellow believers and describes it as evidence that a person has passed from death to life. It deepens the second test in verse 10 by showing how love is the mark of genuine new life.
Matthew 5:9
Blessed are the peacemakers, for they shall be called children of God.
(WEB)
Jesus calls the peacemakers “children of God,” linking the family image to acts of reconciliation and goodwill. It shows that the identity John describes is seen in how people treat others and work for peace.
A Short Prayer From 1 John 3:10
Father, you have called me your child, and I want my life to show it. Where I have been careless with my words or quick to set aside a brother or sister, forgive me and renew my heart. Teach me to do what is right in small things and in large, and to love the people you have placed around me with patience and honesty. Let my daily choices make it clear whose family I belong to, and keep me close to you as I grow. Amen.
