摩訶止觀 7.67

7.67

如是空即無相、無作及一切法；一切法亦如是。當知一解脫門即三解脫門；三解脫門即一門。又四門中皆修三解脫，互無障礙。如此三門，意非次第。別雖次第，皆緣實相。又異通教，通緣空理。復異三藏，三藏緣四諦智。故知三脫及與道品節節有異，須善識之。

Such emptiness is animitta, apraṇihita, and all dharmas; all dharmas are likewise so. One should know that a single gate of liberation is the three gates of liberation; the three gates of liberation are a single gate. Furthermore, within the four gates one cultivates all three liberations, without mutual obstruction. These three gates are non-gradual in meaning. Although in the distinctive [teaching] they are gradual, both rely on true reality. Again, it differs from the shared teaching, for the shared relies on the principle of emptiness. It also differs from the Tripiṭaka, for the Tripiṭaka relies on the wisdom of the four truths. Therefore, one should know that the three liberations and the factors of the path differ stage by stage; one must understand them well.