《晋书·志·第十九章》
云从山上兴起，弥漫天空；天上气乱，所以惩罚是长久阴天。另一种说法，主上言行不恰当，那么下臣就会强盛，遮蔽了君主的圣明。
云起于山，而弥于天；天气乱，故其罚恆阴，一曰： 上失中，则下强盛而蔽君明也。 
Clouds rise from the mountains and cover the sky; the celestial qi is in chaos, so the punishment is long-lasting overcast weather. Another interpretation is that if the sovereign's words and deeds are inappropriate, then the lower servants will become powerful and obscure the sovereign's sagehood.