In this way, we know that we love those born of God: when we love God and do his commandments
Other versions
King James Version
By this we know that we love the children of God, when we love God, and keep his commandments.English Standard Version
By this we know that we love the children of God, when we love God and obey his commandments.New International Version
This is how we know that we love the children of God: by loving God and carrying out his commands.