John Gill expounds on the internal acts and works of God, emphasizing that God's decrees are eternal, sovereign, and immutable. He explains that God's internal acts, which include His purposes and decrees, are essential to understanding His nature and operations. These decrees encompass all things that come to pass, from creation to individual destinies, and are rooted in God's wisdom and sovereignty. Gill highlights that God's decrees are not influenced by external factors and ultimately serve to glorify Him. The sermon calls believers to recognize the depth of God's plans and the assurance that His purposes will be fulfilled.