因明入正理論疏 2.157

2.157

述曰：此結不定。若宗同品，電、空為同，俱非勤勇所顯發故。若因同法，電、瓶為同，俱無常故。此因雖於宗同品空上無，雙於宗同、異二品電、瓶上有，不唯定成一宗，故亦不定，亦前二也。

The commentary explains: This concludes with being inconclusive. As for the homologous class of the proposition, lightning and space are homologous, because both are not manifested by deliberate effort. As for the homologous property of the reason, lightning and pots are homologous, because both are non-eternal. Although this reason is absent in space, which belongs to the homologous class of the proposition, it is present in both lightning and pots, which belong to the homologous and heterologous classes of the proposition; not conclusively establishing only one proposition, it is therefore also inconclusive, just like the previous two.