Pastor Jacob Michalski's sermon on chapters 4 and 5 of Revelation focuses on two main themes: "Behold the Almighty God" and "Behold the Victorious Lamb." John witnesses the throne room of heaven where God Almighty sits in majesty, surrounded by 24 elders and four living creatures who worship Him continuously, establishing that God is the center of all worship. When a sealed scroll appears that no one is worthy to open, causing John to weep in despair, Jesus appears as both the "Lion of Judah" and the "slain Lamb" who is worthy to take the scroll because of His sacrificial death and resurrection. The sermon concludes with the encouragement that Jesus, as the victorious lamb, holds the destiny of the world in His hands, offering hope to believers that He is in control regardless of life's struggles and persecution.