Saul of Tarsus was on his way to Damascus, bent on destroying the city's Christian community, when a blinding flash of light stopped him in his tracks. Forever changed, the former persecutor of Christians adopted the name Paul and became one of the faith's most famous and active converts. Paul's living example, showing that no sinner is beyond redemption, added a powerful weight to his missionary work. The apostle's letters to churches that he established or visited...