淨名經集解關中疏 1.282

1.282

是身為空離我我所　此五空界觀身之呻吟猶槖籥哉。聲動因空空無我所。既無我所。何以外空耶。

"This body is empty, devoid of self and what belongs to self." This fifth contemplation of the space element compares the body's breathing to a bellows. Vocalization and movement depend on space, and space has no 'what belongs to self.' Since there is no 'what belongs to self,' how could it be outside of emptiness?