It is a miracle, beyond human comprehension. The Holy Spirit of God indwells our inner person or spirit. In fact, if a person is not indwelt by God the Holy Spirit, they can not be born again. Nor can they be a genuine Christian or a child of God. Nor can they be forgiven of their sins and have eternal salvation and life. God lives in the life of every true Christian and that Christian is able to communicate with the Holy Spirit, through their recreated spirit, on a consistent, daily basis. You became a born again child of God when you repented of your sins and made Jesus Christ, the Lord of your life.