Read 1 John 5:1-6
Whoever believes that Jesus is the Messiah is a child of God; and whoever loves a father loves his child also. 2This is how we know that we love God’s children: it is by loving God and obeying his commands. 3For our love for God means that we obey his commands. And his commands are not too hard for us, 4because every child of God is able to defeat the world. And we win the victory over the world by means of our faith. 5Who can defeat the world? Only the person who believes that Jesus is the Son of God.
6 Jesus Christ is the one who came with the water of his baptism and the blood of his death. He came not only with the water, but with both the water and the blood. And the Spirit himself testifies that this is true, because the Spirit is truth.
We know we are children of God - when we love God and we love his children. This is the true mark of the Holy Spirit in our lives - hearts transformed by love.
Lord I'm not always that good at loving your children. Help me more I pray.