Read Jack Kelley's Can We Have a Personal Relationship with God at Grace Thru Faith.
But as many as received Him, to them He gave the right to become children of God, even to those who believe in His name, who were born, not of blood nor of the will of the flesh nor of the will of man, but of God.
Jesus answered and said to him, "Truly, truly, I say to you, unless one is born again he cannot see the kingdom of God." Nicodemus said to Him, "How can a man be born when he is old? He cannot enter a second time into his mother's womb and be born, can he?" Jesus answered, "Truly, truly, I say to you, unless one is born of water and the Spirit he cannot enter into the kingdom of God. "That which is born of the flesh is flesh, and that which is born of the Spirit is spirit. "Do not be amazed that I said to you, 'You must be born again.' "The wind blows where it wishes and you hear the sound of it, but do not know where it comes from and where it is going; so is everyone who is born of the Spirit."
For you have not received a spirit of slavery leading to fear again, but you have received a spirit of adoption as sons by which we cry out, "Abba! Father!" The Spirit Himself testifies with our spirit that we are children of God, and if children, heirs also, heirs of God and fellow heirs with Christ, if indeed we suffer with Him so that we may also be glorified with Him.
But when 1the fullness of the time came, God sent forth His Son, born of a woman, born under the Law, so that He might redeem those who were under the Law, that we might receive the adoption as 4sons. 6 Because you are sons, God has sent forth the Spirit of His Son into our hearts, crying, "Abba! Father!" Therefore you are no longer a slave, but a son; and if a son, then an heir through God.