Why is it said that Jesus was born of God?

The concept of being 'born of God' emphasizes that spiritual rebirth is not accomplished through human lineage, ancestry, or personal will but is solely the work of God. John 1:13 makes it clear that this birth is not by blood, nor by the will of flesh, nor by the will of man, but by God. This highlights the grace of God in salvation, illustrating that apart from His action, no one could come to faith. It signifies that true identity and belonging in God's family is given by God's grace to those He has chosen, reinforcing the belief in sovereign grace theology that human ability plays no part in this divine process.