Summary: Believing in Jesus as the Messiah means loving God and His children, obeying His commandments, not burdensome but a path to overcoming the world. God's testimony affirms Jesus.
Beloved: Everyone who believes that Jesus is the Christ is begotten by God, and everyone who loves the Father loves also the one begotten by him.
In this way we know that we love the children of God when we love God and obey his commandments.
For the love of God is this, that we keep his commandments. And his commandments are not burdensome, for whoever is begotten by God conquers the world. And the victory that conquers the world is our faith.
Who indeed is the victor over the world but the one who believes that Jesus is the Son of God?
This is the one who came through water and blood, Jesus Christ, not by water alone, but by water and blood. The Spirit is the one who testifies, and the Spirit is truth. So there are three that testify, the Spirit, the water, and the blood, and the three are of one accord.
If we accept human testimony, the testimony of God is surely greater. Now the testimony of God is this, that he has testified on behalf of his Son.