What does it mean that the Kingdom of God is for those born of God?

The Kingdom of God is fundamentally composed of those who have been spiritually reborn—those "born of God" as articulated in John 3:6. This rebirth signifies a new identity and relationship with Christ, who reigns over His people. Thus, to be part of the Kingdom means being included among the children of God, as seen in Ephesians 1:4-5, where believers are described as chosen and predestined according to God's eternal plan. This understanding reinforces the significance of grace in salvation, demonstrating that entry into the Kingdom is a gift from God, not based on human merit.