In view of that great day the word of God, in the most solemn and impressive language, calls upon His people to arouse from their spiritual lethargy and to seek His face with repentance and humiliation: “Blow ye the trumpet in Zion, and sound an alarm in My holy mountain: let all the inhabitants of the land tremble: for the day of the Lord cometh, for it is nigh at hand.” “Sanctify a fast, call a solemn assembly: gather the people, sanctify the congregation, assemble the elders, gather the children: ... let the bridegroom go forth of his chamber, and the bride out of her closet. Let the priests, the ministers of the Lord, weep between the porch and the altar.” “Turn ye even to Me with all your heart, and with fasting, and with weeping, and with mourning: and rend your heart, and not your garments, and turn unto the Lord your God: for He is gracious and merciful, slow to anger, and of great kindness.” Joel 2:1, 15-17, 12, 13. (GC 311.1) MC VC

To prepare a people to stand in the day of God, a great work of reform was to be accomplished. God saw that many of His professed people were not building for eternity, and in His mercy He was about to send a message of warning to arouse them from their stupor and lead them to make ready for the coming of the Lord. (GC 311.2) MC VC

This warning is brought to view in Revelation 14. Here is a threefold message represented as proclaimed by heavenly beings and immediately followed by the coming of the Son of man to reap “the harvest of the earth.” The first of these warnings announces the approaching judgment. The prophet beheld an angel flying “in the midst of heaven, having the everlasting gospel to preach unto them that dwell on the earth, and to every nation, and kindred, and tongue, and people, saying with a loud voice, Fear God, and give glory to Him; for the hour of His judgment is come: and worship Him that made heaven, and earth, and the sea, and the fountains of waters.” Revelation 14:6, 7. (GC 311.3) MC VC