The book of Romans by Paul 

Explaining The Bible on Instagram: "Saint Paul, originally named Saul of Tarsus, was a zealous Pharisee and persecutor of the early Christian church until his dramatic conversion on the road to Damascus around AD 33–36 (Acts 9:1-19). There, the risen Jesus appeared to him, blinding him temporarily and calling him to be an apostle to the Gentiles. After his baptism and time in Arabia and Damascus, Paul became the foremost missionary of the early church, undertaking three major journeys across the