Angels

Lower down in the chapter, the countless multitude of angels celebrate His praise, but they are lower down in another sense too. An angel cannot speak of Him as the One "who loved me, and gave Himself for me." They praise Him for what He is to the saints. Like the servants at the welcome of the prodigal son, the angels praise the Master for what they learn Him to be as a father in His welcome of His long-lost son. But this does not change their position; they are still the servants.
Then John hears every creature in heaven and in earth, and under the earth, taking up the praise. This is anticipative, but it was given to John to know it beforehand for the comfort of our hearts.
Peter, who had been with the Lord in the holy mountain, could say that he had seen the power and coming of our Lord Jesus Christ. But in point of fact that day is future, though for his special comfort he had a vision of it. And so it was with John. It is the grand result before his eye, as sample and pledge of what it will be when the blessed Lord shall have risen up from His Father's throne to banish the adversary from the wide universe. No place will be left for Satan in the scene that God had created for His glory.
What grace of our God to show us this glorious future, when all the mind in heaven and earth shall be one in worshipping Him who sits upon the throne and in adoring the Lamb.