Horatius Bonar emphasizes the urgency and universality of the everlasting gospel as proclaimed in Revelation 14:6, highlighting that this glad message is to be shared widely as the end approaches. He explains that angels play a significant role in the dissemination of the gospel, acting as invisible agents that stir human hearts to spread the good news. The gospel is characterized by God's free love, the sacrificial gift of His Son, and the promise of righteousness and access to His kingdom. Bonar reassures that this everlasting gospel is unchanging and relevant for all ages and nations, urging listeners to respond as the hour of judgment draws near. He calls for a renewed commitment to proclaiming this message with urgency and clarity.