摩訶止觀 7.62

7.62

若三藏，以苦下空、無我是空門；滅下四行是無相門；集道下八行、苦下兩行是無作門。此十六行王臣等（云云）。

Under the Tripiṭaka [teaching], emptiness and non-self under suffering are the gate of emptiness; the four aspects under cessation are the gate of signlessness; the eight aspects under origin and the path, together with the two aspects under suffering, are the gate of wishlessness. These sixteen aspects are the king and minister, etc. (and so forth).