What does Acts 8:29 mean?

An angel has told the deacon and evangelist Philip to go to the road that leads from Jerusalem down to Gaza. While there, he finds an Ethiopian official of the queen's court riding in a chariot, returning home from worshiping in Jerusalem (Acts 8:26–28). The Holy Spirit tells Philip to get closer, and Philip finds the man is reading Isaiah 53:7–8, the passage that describes an innocent man being led like a lamb to the slaughter (Acts 8:32–33).

The Holy Spirit is essential for the spread of the gospel and the health of the church. Jesus promised the disciples that the Holy Spirit would have an active role in the spread of the gospel. He said, "And when he comes, he will convict the world concerning sin and righteousness and judgment" (John 16:8). The Holy Spirit will glorify Jesus by guiding His followers to the truth (John 16:12–14). Jesus explained that the Holy Spirit couldn't come to them until Jesus left (John 16:7). A little more than a week after Jesus' ascension, the Holy Spirit came to indwell His followers (Acts 1:3, 9; 2:1–4).

The Holy Spirit will continue to directly lead the Jesus-followers to where they need to be. He will tell Peter to evangelize the Gentiles of Cornelius' house (Acts 10:19–20), tell the believers in Antioch to send Paul and Barnabas to preach to the Gentiles (Acts 13:2), and let Paul know he will be arrested in Jerusalem (Acts 20:22–23; 21:11). He also empowers the Jesus-followers to preach Jesus' message of forgiveness (Acts 4:8, 31; 6:10) and direct the church in evangelistic and theological matters (Acts 9:10–12; 15:28; 16:6–7; 19:21).