Every person who believes that Jesus is, in fact, the Messiah, is God-begotten. If we love the One who conceives the child, we'll surely love the child who was conceived.
Jesus--the Divine Christ! He experienced a life-giving birth and a death-killing death. Not only birth from the womb, but baptismal birth of his ministry and sacrificial death. And all the while the Spirit is confirming the truth, the reality of God's presence at Jesus' baptism and crucifixion, bringing those occasions alive for us.
If we take human testimony at face value, how much more should we be reassured when God gives testimony as he does here, testifying concerning his Son.
Whoever believes in the Son of God inwardly confirms God's testimony. Whoever refuses to believe in effect calls God a liar, refusing to believe God's own testimony regarding his Son.
My purpose in writing is simply this: that you who believe in God's Son will know beyond the shadow of a doubt that you have eternal life, the reality and not the illusion.
For instance, if we see a Christian believer sinning (clearly I'm not talking about those who make a practice of sin in a way that is "fatal," leading to eternal death), we ask for God's help and he gladly gives it, gives life to the sinner whose sin is not fatal. There is such a thing as a fatal sin, and I'm not urging you to pray about that.
We know that none of the God-begotten makes a practice of sin--fatal sin. The God-begotten are also the God-protected. The Evil One can't lay a hand on them.
And we know that the Son of God came so we could recognize and understand the truth of God--what a gift!--and we are living in the Truth itself, in God's Son, Jesus Christ. This Jesus is both True God and Real Life.