因明入正理論疏 2.151

2.151

論　此中非勤勇無間所發宗，以電、空等為其同品，此無常性於電等有、於空等無。

[The text of the *Nyāyapraveśa*] states: Here, for the proposition "not produced immediately through deliberate effort," lightning, space, and the like are its homologous class; this non-eternality exists in lightning and the like, and is absent in space and the like.