We have seen and testify to the fact that the Father sent his Son as the Savior of the world.
God lives in those who declare that Jesus is the Son of God, and they live in God.
We have known and believed that God loves us. God is love. Those who live in God's love live in God, and God lives in them.
God's love has reached its goal in us. So we look ahead with confidence to the day of judgment. While we are in this world, we are exactly like him [with regard to love].
No fear exists where his love is. Rather, perfect love gets rid of fear, because fear involves punishment. The person who lives in fear doesn't have perfect love.
We love because God loved us first.
Whoever says, "I love God," but hates another believer is a liar. People who don't love other believers, whom they have seen, can't love God, whom they have not seen.
Christ has given us this commandment: The person who loves God must also love other believers.