Paul discovered that his imprisonment advanced the gospel in several ways: 1) Many brothers and sisters were emboldened in their faith by Paul's example of preaching while in chains. 2) Paul was able to preach the gospel to many people who visited him in prison, including the palace guard and King Agrippa. 3) Some preached out of jealousy of Paul, but the gospel still spread, both from sincere and insincere motives. Paul was joyful that Christ was being preached regardless of the motives.