In 1738, he heard a reading of Luther's preface to the Epistle to the Romans, and penned the now famous lines: "I felt my heart strangely warmed". He then knew that God had forgiven him and that he was accepted by God. This revolutionized his ministry. Charles had a similar experience of salvation about the same time. John Wesley wrote many books about Scripture and the Christian life. Charles Wesley helped him with many hymns he wrote. These hymns supported the message that John preached.