If anyone says, ‘I love God,’ and yet hates his brother or sister, he is a liar. For the person who does not love his brother or sister whom he has seen cannot love God whom he has not seen.
But the one who hates his brother or sister is in the darkness, walks in the darkness, and doesn’t know where he’s going, because the darkness has blinded his eyes.
This is how God’s children and the devil’s children become obvious. Whoever does not do what is right is not of God, especially the one who does not love his brother or sister.