The central message of this sermon is that despite appearances and circumstances, God is always in control and works through unexpected means to achieve His purposes. The story of Cyrus the Great and the conquest of Babylon illustrates how God can use even the most unlikely individuals and situations to fulfill His plans. Through the episode of Belshazzar's banquet and the mysterious writing on the wall, the sermon highlights the futility of pagan wisdom and the inability of human beings to fully understand or control events without divine intervention. The takeaway from this message is that God's sovereignty and providence are not limited by human limitations or expectations, and He often uses unexpected means to bring about His will. This advances the belief in the sovereignty and omnipotence of God, emphasizing that He is always at work in the world, even when it seems that human beings are in control.