Paul's Missionary Journeys

If the early church has an engine, it is the missionary journeys of the apostle Paul. Across roughly fifteen years and several long expeditions, the gospel travels from its base in Syrian Antioch across Asia Minor and into the heart of the Greek and Roman world — and the letters Paul writes along the way become a large part of the New Testament.

Acts records the arc. On the first journey Paul and Barnabas plant churches in Cyprus and southern Asia Minor, prompting the Jerusalem council to affirm that Gentiles need not become Jews to follow Christ. On the second, Paul crosses into Europe, founding churches in Philippi, Thessalonica, and Corinth and preaching at Athens. On the third he ministers at length in Ephesus, a hub from which the gospel spreads across the province. Arrested in Jerusalem, Paul appeals to Caesar and is taken under guard to Rome — and Acts ends with him there, preaching freely while awaiting trial. Out of these travels come the letters to Galatia, Thessalonica, Corinth, Rome, and the churches written from prison.

Dates are reasonably firm, anchored by fixed points like Paul's appearance before the proconsul Gallio in Corinth (c. AD 51); the journeys run from the late 40s into the early 60s. This closer look sits within the broader Early Church era. Its importance is twofold: historically, it is how Christianity became a faith of the nations rather than a Jewish sect; and theologically, the letters born from it — on grace, justification, the church, and the return of Christ — have shaped Christian belief ever since. The journeys embody the church's defining conviction that the good news is for the whole world.