The Early Church

Weeks 21–41

Overview

This is the longest phase of the study — twenty-one weeks — and for good reason. In Phase 5 you will watch the resurrection of Jesus produce an explosion that reshapes the ancient world. A handful of frightened disciples become a Spirit-empowered movement that crosses every boundary the ancient world could construct: Jew and Gentile, slave and free, east and west, synagogue and empire. And you will read the story the way it actually happened, with Paul’s letters placed at the points in Acts when he wrote them, so that the theology and the history illuminate each other.

It begins in a locked room in Jerusalem and ends in a rented house in Rome. On the Day of Pentecost, the Holy Spirit falls like fire, and Peter — who weeks earlier could not admit to a servant girl that he knew Jesus — stands before thousands and preaches a sermon that baptizes three thousand people in a single day. The infant church devotes itself to teaching, fellowship, the breaking of bread, and prayer. It shares its possessions. It heals in Jesus’ name. And it immediately attracts the hostility of the same authorities who crucified its Lord.

The first martyr, Stephen, dies with a vision of heaven and a prayer for his killers. His death scatters the believers beyond Jerusalem, and what looks like a catastrophe becomes the engine of the gospel’s advance. Philip carries the message to Samaria and to an Ethiopian official on a desert road. Then God does something no one expected: he strikes down Saul of Tarsus, the church’s most zealous persecutor, on the road to Damascus and remakes him into its greatest missionary. Peter receives a vision that overturns centuries of Jewish dietary law and baptizes a Roman centurion named Cornelius. The door to the Gentiles swings open, and it will never close again.

From Antioch — the first church with a truly mixed Jewish-Gentile congregation — Paul and Barnabas launch into the wider Mediterranean world. The gospel reaches Cyprus, the mountains of Asia Minor, and the sophisticated cities of Greece. At every stop the pattern repeats: Paul preaches in the synagogue, some Jews believe, most resist, Gentiles flood in, and controversy follows. The letter to the Galatians erupts from this tension — a fierce defense of the gospel of grace against those who would require Gentile converts to keep the Jewish law. The Jerusalem Council settles the matter: salvation is by grace through faith, not by circumcision and Torah observance. The theological foundation of Christianity is laid in these chapters, and you will read it as it unfolded in real time.

Paul’s second and third missionary journeys take the gospel deeper into the Roman world — to Philippi, Thessalonica, Athens, Corinth, and Ephesus. At each city he plants churches, and to those churches he writes the letters that make up the heart of the New Testament. You will read 1 and 2 Thessalonians while Paul is in Corinth, wrestling with questions about the return of Christ and the fate of believers who have died. You will read 1 and 2 Corinthians while Paul is in Ephesus, confronting a church torn apart by divisions, sexual immorality, lawsuits, and misunderstandings about spiritual gifts, worship, and the resurrection. These are not abstract theological treatises. They are urgent pastoral letters written to real communities struggling with real problems — and the problems sound remarkably familiar two thousand years later.

At the center of this phase stands the letter to the Romans — Paul’s masterpiece, spread across three full weeks. Written from Corinth on the eve of his final journey to Jerusalem, Romans is the most systematic presentation of the gospel in all of Scripture. It moves from the universal reality of human sin through the gift of justification by faith, the freedom of life in the Spirit, the mystery of God’s purposes for Israel, and the practical outworking of the gospel in everyday community life. If you have ever wondered what the gospel actually is — not as a slogan but as a comprehensive account of what God has done, is doing, and will do — Romans is the answer.

The phase closes with gathering storm clouds. Paul returns to Jerusalem against the warnings of his friends, is arrested in the temple, and spends years in Roman custody — first in Caesarea, then on a harrowing sea voyage to Rome itself. From prison he writes some of his most luminous letters: Ephesians, Philippians, Colossians, and Philemon. Chains cannot silence him. The letter to the Philippians, written from a Roman cell, is saturated with joy. The letter to the Ephesians soars to the highest heights of New Testament theology — the eternal purpose of God to unite all things in Christ. And the brief letter to Philemon, about a runaway slave, demonstrates what the gospel looks like when it reaches down into the most ordinary and unjust structures of the ancient world and begins to transform them from within.

By the end of Phase 5, the gospel has traveled from a locked room in Jerusalem to the capital of the empire. The church is no longer a Jewish sect. It is a global movement, messy and magnificent, sustained not by human strategy but by the Spirit who fell at Pentecost and has never left.

Weeks in This Phase