John Gill emphasizes the certainty of prophecy's fulfillment, particularly regarding the coming of Christ and the establishment of His kingdom. He reflects on past prophecies that have been realized, such as Christ's ministry in Galilee, and argues that just as these have come to pass, so too will the remaining prophecies concerning the increase of Christ's government and the destruction of antichrist be fulfilled. Gill highlights the zeal of the Lord as the driving force behind these fulfillments, assuring believers of God's unwavering commitment to His promises. He encourages the congregation to trust in God's word and to remain steadfast in prayer as they await the complete realization of His prophecies.