But what does it mean to be born again?
Being born again is a work of God whereby the Holy Spirit enters into the very existence of a human being to abide, thereby infusing spiritual life into and establishing an intimate, mutual fellowship with that person. It is a transformative experience, but not so much that it so thoroughly changes the person that he or she does not retain his or her personal self-awareness. It is transformation by addition rather than subtraction, which allows the born again person to begin to to experience communication with God, to perceive life differently, to relate to people differently, to valuate things differently and to live differently than they did prior to the experience. Before the experience, the born again are singular beings separated from God; afterwards, the born again are people with two natures with one connected to God.
Ultimately, the natural self, the sinful self, will be changed in the born again, completely regenerated into a new nature like unto Christ's. That new eternal creature will possess a singular nature in unity with the Father akin to that which Christ shared with the Father as he walked on the earth. Then, we will be on the same page with God, never to go astray again. Ultimately, regeneration is not being renewed to Adam's nature prior to the Fall, but surpassing it, and being transformed into Christ's nature as the second Adam, the Son of Man.
Our born again experience in the Holy Spirit now is the down payment of that good thing to come.