法苑珠林 4.67

4.67

依分別功德論云。雨有三種。一天雨。二龍雨。三阿脩羅雨。天雨細霧。龍雨甚麁。喜則和潤。瞋則雷電。阿脩羅為共帝釋鬪亦能降雨。麁細不定（依經雨亦多種或有無雲而雨。或有先雲而雨。或有因龍而雨。或有不依龍而雨寔由眾生自業所感。具如經說也）。

According to the Fenbie gongde lun: Rain is of three kinds: first, heavenly rain; second, nāga rain; third, asura rain. Heavenly rain is a fine mist; nāga rain is extremely heavy—when pleased it is harmonious and moistening, when angry it is thunder and lightning. The asuras, when fighting with Śakra, are also able to make rain fall, which is variable in heaviness and fineness. (According to the sūtras, rain is also of many kinds: sometimes it rains without clouds, or it rains after clouds form; sometimes it rains because of nāgas, or it rains without relying on nāgas; it is truly brought about by the sympathetic resonance of sentient beings' own karma, as fully explained in the sūtras.)