John Gill emphasizes the importance of giving glory and dominion to God, as expressed in 1 Peter 5:11. He explains that glory is due to God for the grace He bestows upon humanity, reflecting a heart filled with gratitude for His divine goodness. Gill highlights that God's dominion signifies His sovereign rule over all creation and His providential care, which obligates believers to obedience. The sermon concludes with the affirmation 'Amen', indicating a prayerful belief in the truth of these declarations. This doxology serves as a reminder of our responsibility to honor God for His grace and authority.