The central message of this sermon is that God's word, even when spoken in difficult circumstances or to a skeptical audience, can still have profound effects and spread widely. The testimony of Paul, particularly his account of his conversion on the road to Damascus, is not merely an attempt to persuade a specific group of people but rather a declaration of truth that can resonate with anyone who hears it. This message advances the idea that Christianity's unique claims about the risen Jesus are not just "Jewish stuff" but have universal significance and implications. The takeaway is that even in situations where immediate conversions may not occur, God's word has the power to spread and bear fruit over time, especially when spoken to influential people who will pass it on to others.