仁王般若經疏 3.143

3.143

「天地國土亢陽，炎火洞然，百草亢旱，五穀不登，土地赫然，萬姓滅盡，如是變時亦讀說此經，為六難也。」

"When heaven, earth, and the realm suffer excessive yang, with blazing fires flaring up, the grasses parched with drought, the five grains not ripening, the land scorching, and the myriad people completely extinguished—when such portents appear, one should also read and recite this sūtra: this is the sixth calamity."