Horatius Bonar preaches on Revelation 7:9-10, illustrating the glorious vision of a great multitude from all nations standing before the throne and the Lamb, clothed in white robes and holding palms, symbolizing victory and joy. He emphasizes the vastness of this assembly, which transcends earthly divisions, showcasing the unity of believers redeemed by Christ's blood. Bonar highlights their triumphant posture, the purity of their garments, and the significance of their loud proclamation of salvation, celebrating their eternal joy in the presence of God. This sermon invites listeners to reflect on the inclusivity of God's kingdom and the ultimate victory of salvation.