Believe it or not the above question has an incredibly simple answer, but the things you have to understand to grasp it are not so easy. Let us start with a question.
“Then a voice came from the throne, saying, ‘Praise our God, all you His servants and those who fear Him, both small and great!’ And I heard, as it were, the voice of a great multitude, as the sound of many waters and as the sound of mighty thunderings, saying, ‘Alleluia! For the Lord God Omnipotent reigns!’” Revelation 19:5-6.
“And I looked, and behold, a white cloud, and on the cloud sat One like the Son of Man, having on His head a golden crown, and in His hand a sharp sickle.” Revelation 14:14.
“Then I saw another angel flying in the midst of heaven, having the everlasting gospel to preach to those who dwell on the earth – to every nation, tribe, tongue, and people – saying with a loud voice, ‘Fear God and give glory to Him, for the hour of His judgment has come; and worship Him who made heaven and earth, the sea and springs of water.’” Revelation 14:6-7.