因明入正理論疏 2.141

2.141

論　言不共者，如說聲常，所聞性故。常、無常品皆離此因，常、無常外餘非有故，是猶預因。

[The text of the *Nyāyapraveśa*] states: As for the uncommon [inconclusive reason], it is as when one says: "Sound is eternal, because it has audibility." Both the eternal and non-eternal classes are excluded from this reason, and outside the eternal and non-eternal there exists nothing else; therefore it is a reason that produces hesitation.