ANSWER: To be converted is to be turned back from the course one is pursuing. Peter in a few hours would be in the way of apostasy, when by divine grace, the grace of repentance, which accompanied the sorrowful look of Jesus, he would be turned back to loyalty and love to his Master. (2) Peter became a disciple of Christ, a Christian, when he left all and followed him. By his apostasy he lost justifying faith, but not the faith of conviction and penitence. As a backslider he needed to be restored and was restored, within a few hours after his fall.
— Steele's Answers p. 173.