摩訶止觀 9.141

9.141

若不去者，當安心止觀，善巧迴轉，方便修習或止、或觀。若觀一念禪定，二邊寂滅，名「體真止」；照法性淨，無障無礙，名「即空觀」。又觀禪心即空、即假，雙照二諦而不動真際，名「隨緣止」；通達藥病，稱適當會，名「即假觀」。又深觀禪心，禪心即空、即假、即中，無二無別，名「無分別止」；達於實相、如來藏、第一義諦無二無別，名「即中觀」。三止三觀在一念心，不前不後、非一非異。為破二邊，名「一」、名「中」；為破偏著、生滅，名「圓」、「寂滅」；為破次第三止三觀，名「三觀一心」。實無中、圓、一心定相。以此止觀而安其心（云云）。

If one still does not proceed, one should settle the mind through calming and contemplation, turning them skillfully, and cultivating either calming or contemplation as expedients. If one contemplates a single thought-moment of dhyāna, with the two extremes quiesced, this is called 'calming that embodies the real'; illuminating dharmatā as pure, unobstructed, and unimpeded is called 'contemplation that is identical with emptiness'. Furthermore, contemplating the dhyāna mind as both identical with emptiness and identical with the provisional, doubly illuminating the two truths without moving from the true limit, is called 'calming that accords with conditions'; penetrating medicines and diseases and meeting them appropriately is called 'contemplation that is identical with the provisional'. Furthermore, contemplating the dhyāna mind deeply—where the dhyāna mind is identical with emptiness, identical with the provisional, and identical with the middle, without duality or distinction—is called 'calming of non-discrimination'; penetrating to true reality, the tathāgatagarbha, and the truth of the supreme meaning as without duality or distinction is called 'contemplation that is identical with the middle'. The three calmings and three contemplations exist in a single thought-moment of the mind, neither before nor after, neither one nor different. In order to break the two extremes, they are called 'one' and called 'the middle'; in order to break biased attachments to arising and ceasing, they are called 'perfect' and 'quiescence'; in order to break the sequential three calmings and three contemplations, they are called 'the three contemplations in a single mind'. In reality, there are no fixed marks of middle, perfect, or single mind. One settles one's mind with these calmings and contemplations (and so forth).