維摩經略疏垂裕記 4.151

4.151

十、電。「電義未詳」者，又《五經通義》曰「電，雷光也。」顧凱之曰「陰陽相觸為雷為電。」又《經律異相》云「有四電師。」并前兩解，既異說不一，未可定判，故云未詳。

Tenth, lightning. Regarding "the meaning of lightning is not yet clear," the Wujing tongyi states: "Lightning is the glare of thunder." Gu Kaizhi states, "The mutual friction of yin and yang produces thunder and lightning." Moreover, the Jinglü yixiang states, "There are four lightning masters." Together with the two preceding explanations, since the various accounts are not uniform, it cannot be definitively determined; hence it is said to be not yet clear.