Those who believe in Jesus Christ receive this new birth. It is just like a couple adopts an orphan and gave him/her a new life. The main reason behind to love and obey Jesus is new birth. Who so ever gets this new birth, Holy Spirit become activate in him/her. Then the Holy Spirit starts releasing Image and Likeness of God in that person, Holy Spirit starts releasing Glory of God in that person, Holy Spirit starts releasing Nature of God in that person, Holy Spirit starts releasing Power and Miracles of God in that person and Separates him/her from people who are not really born again.