摩訶止觀 8.36

8.36

於即空中翻構苦集，是名「知塞」；於苦集中達即是空，是名「知通」。於諸法藥翻構為病，是名「知塞」；於諸病法即能知藥，是名「知通」。翻法性為無明，名之為「塞」；無明轉即變為明，名之為「通」。

Turning and fabricating suffering and accumulation within what is identical to emptiness is called "knowing the blockage"; penetrating suffering and accumulation as identical to emptiness is called "knowing the passage." Turning and fabricating medicines of dharmas into illnesses is called "knowing the blockage"; being able to know the medicine in various illnesses is called "knowing the passage." Turning dharmatā into avidyā is called "blockage"; transforming avidyā into light is called "passage."