The sermon centers on Psalm 100, emphasizing the call to joyful praise and acknowledging God's sovereignty. It explores the psalm's structure, highlighting the call to make a joyful noise, serve with gladness, and enter God's presence with thanksgiving, ultimately rooted in recognizing God as the creator and sustainer of all. The message underscores the psalm's anticipation of a future where all nations will bow before God, drawing connections to the gospel call and the ultimate fulfillment of God's promise to gather his people from every nation in worship, affirming God's steadfast love and faithfulness as the foundation for grateful adoration.