摩訶止觀 5.239

5.239

如是四句推相續假，求心不得。無四性實，執心即薄，但有心名字。是字不住內、外、兩中間，亦不常自有。相續無性，即世諦破性，名為「性空」；相續無名，即真諦破假，名為「相空」。性相俱空，乃至作十八空，如前說。是名「從假以入空觀」。

Examining the provisionality of continuity through the four propositions in this way, mind cannot be found. Lacking the reality of the four natures, grasping in the mind diminishes, and there is only the name of mind. This name does not abide internally, externally, or in between the two, nor does it eternally exist of itself. Continuity lacking intrinsic nature is the refutation of intrinsic nature by worldly truth, called 'emptiness of nature.' Continuity lacking a name is the refutation of the provisional by ultimate truth, called 'emptiness of characteristics.' Both nature and characteristics being empty extends even to performing the eighteen emptinesses as explained before. This is called 'the contemplation of entering emptiness from the provisional.'