The sermon explores the spiritual lessons derived from Joshua chapter 13, focusing on the concept of remaining land that must still be possessed. It highlights how God continues to use believers in their senior years, emphasizing that service and fruitfulness do not cease with age. The message contrasts the incomplete conquest of the Canaanites with the complete satisfaction found in Christ as the Levite's inheritance. Through this biblical account, the preacher urges listeners to resist sin, remain content in God alone, and actively pursue a deeper walk with Him regardless of their life stage.