The first angel summons people from every nation and tribe and tongue to “fear God and give Him glory, because the hour of His judgment has come’ and to ‘worship Him who made the heavens, the earth, the sea and the springs of water (14:6-7). This ‘eternal gospel’ recalls the vision of chapter 4 and summons the whole creation to acknowledge God as Creator and Lord of history. . . . This passage suggests that evangelism can be viewed from one perspective as a call to worship God.
—David Peterson, “Worship in the Revelation to John” The Reformed Theological Review 47:3 (Sept-Dec’88), 71.