摩訶止觀 1.156

1.156

理即者，一念心即如來藏理。「如」故即空，「藏」故即假，「理」故即中；三智一心中具，不可思議。如上說「三諦一諦、非三非一」；一色一香、一切法、一切心亦復如是。是名「理即是菩提心」，亦是「理即止觀」。即寂名「止」；即照名「觀」。

‘Identity in principle’ means that a single thought-moment of the mind is the principle of the tathāgatagarbha itself. Being ‘thus’ (tathā), it is identical to emptiness; being ‘garbha’ (storehouse), it is identical to the provisional; being ‘principle’, it is identical to the middle; the three wisdoms are complete within a single thought-moment of the mind, inconceivable. As stated above, ‘the three truths are one truth, neither three nor one’; a single color, a single fragrance, all phenomena, and all minds are also like this. This is named ‘identity in principle being the aspiration for bodhi’, and is also ‘identity in principle being calming and contemplation’. Being identical to quiescence is named ‘calming’; being identical to illumination is named ‘contemplation’.