We know (we will not go there), Luke 12:32 says that those who believe in Him are a little flock. They are the ones whom the Father calls personally and gives the Kingdom in His good pleasure. So He calls them and says, "I'm giving you the Kingdom of God," once they repent and have the Holy Spirit and such. All this happens at God's good pleasure. It is all by grace, we would say. It is His favor upon us that He has chosen specific ones. He has called the elect one by one and brought them to Jesus Christ and Jesus Christ then, as the Head of the church, takes over our education and conversion or change into the image of Jesus Christ.