Cross reference
1 John 5:5
5 Who is he who overcomes the world, but he who believes that Jesus is the Son of God?
1 John 4:15
15 Whoever confesses that Jesus is the Son of God, God remains in him, and he in God.
1 John 5:1
1 Whoever believes that Jesus is the Christ is born of God. Whoever loves the father also loves the child who is born of him.