因明入正理論疏 2.124

2.124

論　虛空實有，德所依故。對無空論，所依不成。

[Nyāyapraveśa:] "Space is a real entity, because it is the substratum of qualities." Against those who maintain that space is non-existent, this is [the fallacy of] the substratum being unestablished (āśrayāsiddha).