The central message of this sermon is that God's ultimate plan for humanity is one of redemption and restoration, but it will only be achieved through judgment and correction of the present sinful state. The preacher emphasizes that the future "latter days" described in Isaiah 2-4 are not just a distant hope, but a real possibility that requires individuals to make changes in their lives now. Through the lens of this passage, the preacher advances the belief that God's people must be holy and distinct from the world, and that sin will ultimately lead to judgment. The takeaway for listeners is that they should remain faithful to God amidst the challenges and difficulties of life, trusting that He has a good future in store for those who obey Him.