To prepare a people to stand in the day of God, a great work of reform was to be accomplished [by the Advent Movement]. 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. "Behold, I will send you Elijah the prophet before the coming of the great and dreadful day of the Lord." Mal. 4:5