I saw that the remnant were not prepared for what is coming upon the earth. Stupidity, like lethargy, seemed to hang upon the minds of most of those who profess to believe that we are having the last message. My accompanying angel cried out with awful solemnity, “Get ready! get ready! get ready! for the fierce anger of the Lord is soon to come. His wrath is to be poured out, unmixed with mercy, and ye are not ready. Rend the heart, and not the garment. A great work must be done for the remnant. Many of them are dwelling upon little trials.” Said the angel, “Legions of evil angels are around you, and are trying to press in their awful darkness, that ye may be ensnared and taken. Ye suffer your minds to be diverted too readily from the work of preparation and the all-important truths for these last days. And ye dwell upon little trials and go into minute particulars of little difficulties to explain them to the satisfaction of this one or that.” Conversation has been protracted for hours…
"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, and repenteth him of the evil."
The phrase "Rend the heart, and not the garment" is a direct quote from Joel 2:13, making this an explicit allusion. The context of both passages also deals with repentance and preparation for judgment.