維摩經略疏垂裕記 4.150

4.150

九、浮雲。「雲從龍出」者，《周易》曰「雲從龍，風從虎。」「亦陰陽氣」者，《春秋元命苞》曰「陰陽聚為雲。」

Ninth, floating clouds. Regarding "clouds issue from dragons," the Book of Changes states, "Clouds follow the dragon; wind follows the tiger." Regarding "also the qi of yin and yang," the Chunqiu yuanmingbao states, "The coming together of yin and yang forms clouds."