John Gill expounds on 1 Peter 1:12, emphasizing that the prophets of old searched for the salvation that was revealed to them, which was ultimately meant for future generations, including us. He highlights that while they prophesied about Christ's sufferings and glories, their revelations were not fully realized in their time but serve as a foundation for our faith today. The apostles, empowered by the Holy Spirit, preached the Gospel, making known the fulfillment of these prophecies. Gill also notes the angels' keen interest in the mystery of salvation, illustrating the profound significance of the Gospel. This sermon encourages believers to appreciate the depth of God's plan and the continuity of His revelation through history.