Paul's career is known principally through letters attributed to him and the later narrative in Acts of the Apostles. Several letters are widely accepted by scholars as his own, while the authorship of others remains disputed. He initially opposed followers of Jesus, then described a revelation of the risen Christ that redirected his life toward preaching. Acts gives narrative versions of the encounter on the road to Damascus; those accounts should be distinguished from Paul's more limited autobiographical statements.

Paul traveled and organized congregations in parts of the eastern Roman world, especially among people who were not Jewish. His correspondence connects communities in Asia Minor, Macedonia, and Greece. He supported the position that Gentile believers did not need to become Jews through circumcision and full observance of the law. Disagreement over this question shaped his relations with other early leaders, including Peter and James. Galatians preserves his own forceful account of these disputes rather than a neutral report from every participant.

Letters including Romans, First and Second Corinthians, Philippians, and First Thessalonians addressed worship, ethical conduct, communal conflict, suffering, and the meaning of Jesus's death and resurrection. Paul combined theological argument with practical direction and appeals to personal relationships. He organized a collection for believers in Jerusalem, seeking solidarity among communities separated by region and background. His work relied on coworkers and local hosts, including women named in his letters, so the growth of the congregations cannot be explained through his activity alone.

Acts describes his arrest, legal hearings, appeal to the emperor, and arrival in Rome, where its narrative ends with him preaching under custody. Later Christian tradition associates his execution with Nero's reign, but the precise date and circumstances are not securely established by contemporary evidence. His letters became central to the New Testament and to later debates about grace, faith, law, community, and salvation. Paul's career helped establish networks across the Mediterranean and a framework for including Gentiles within the Jesus movement. A responsible account separates his own testimony, the narrative construction of Acts, and traditions developed after his death, while acknowledging the exceptional influence of the writings preserved under his name.