Rev.7:15 – Then the seventh angel sounded; and there were loud voices in heaven, saying,
“The kingdom of the world has become the kingdom of our Lord and of His Christ; and He will reign forever and ever.”

This passage gives us a glimpse of the end of the age and how it effects the twenty four elders surrounding God’s throne who picture the universal church. These elders give us a glimpse into the life of the church and show us how the judgement of God on the evil world and its culture will effect us.
Obviously these elders saw themselves as distinctly set apart from the world and this judgement on the world was expected and welcomed by them. They take no pleasure in the condemnation of any man, they had spent their lives proving that by preaching the gospel until their death. But when the rejection of the gospel is complete, justice falls quickly and causes the elders to fall on their faces and give glory to the Lord. Here is how Amir Tsarfati describes this in his book on Revelation.

“When the seventh trumpet sounds, another worship service will break out in heaven. It will start with loud voices calling out, which will then be joined by the twenty-four elders. Seeing the end of the rule of the enemy on earth and the soon-coming reign of Christ, they cry out, “The kingdoms of this world have become the kingdoms of our Lord and of His Christ.” This subjection to godly rule is not something that the nations will submit to willingly. They are used to following their master, the devil, and will not readily abandon that allegiance…But no matter how they may rage, God’s plan will prevail. All the nations of the world banded together are no match for the power of the All-Powerful. God’s reclamation of the earth and rule over it has been ordained and is absolute. And those who know God and His goodness can’t help but rejoice at what will undoubtedly be the amazing results.
The second part of this wonderful doxology focuses on reward and loss. Believers will be rewarded and unbelievers will not only lose their earthly gains, but also the opportunity to spend eternity with the God who loves them so much that He died for them.”

I can remember as a young Christian when I began to see myself more and more separated from the world and its culture. I think some of that had to do with preaching the gospel to the lost. I can remember going out on the streets to do evangelism in those early days. I think every time I made a stand for Christ publicly that separation was deepened in my life. In this passage today we see the reverence and worship coming from the elders as the end of all things had come. Most of these elders were martyrs. Testifying to the death will cause that separation to become crystal clear.