Paul understood that his life’s work was “to preach to the Gentiles the unsearchable riches of Christ, and to bring to light for everyone what is the plan of the mystery hidden for ages in God” (Ephesians 3:8-9). But how exactly did he do that? How does anyone do that? When you think of Paul and the apostles’ preaching, you probably imagine grand public sermons preached to riveted audiences of eager listeners. In the beginning, there was some of that. In the first half of Acts, our definitive hi…