The central message of this sermon is that God's people are not meant to be divided by individual personalities or leaders, but rather united under one purpose: spreading the gospel. The text highlights how Paul, Peter, and Apollos were all working together to advance the kingdom, yet some in Corinth began to take sides and choose favorites among these leaders. This division is seen as a departure from God's intention for his people, who are called to be one body with one head - Christ. The sermon suggests that investing time and attention into understanding the Bible, even if it seems impractical or theoretical at first, will ultimately bear fruit in the long run, leading to a deeper understanding of God's plan and a greater sense of unity among his people.