If we say we love God but hate any of our brothers or sisters in his family, we are liars. If we don’t love someone we have seen, how can we love God? We have never even seen him.
But whoever hates their brother or sister is in darkness. They live in darkness. They don’t know where they are going, because the darkness has made them blind.
But those who don’t grow in these blessings are blind. They cannot see clearly what they have. They have forgotten that they were cleansed from their past sins.
So we can see who God’s children are and who the devil’s children are. These are the ones who are not God’s children: those who don’t do what is right and those who do not love their brothers and sisters in God’s family.