金剛三昧經論 2.174

2.174

經曰　大力菩薩言：「三解脫法是何等事？理觀三昧從何法入？」佛言：「三解脫者，虛空解脫、金剛解脫、般若解脫。理觀心者，心如理淨，無可不心。」大力菩薩言：「云何存用？云何觀之？」佛言：「心事不二是名存用。內行外行出入不二，不住一相心無得失，一不一地淨心流入，是名觀之。」

The sūtra says: Mahābalavān Bodhisattva said, "What kinds of matters are the dharmas of the three liberations? Through what dharma does one enter the samādhi of contemplation of principle?" The Buddha said, "The three liberations are space liberation, vajra liberation, and prajñā liberation. As for the mind in contemplation of principle, the mind is pure according with principle, and there is nothing acceptable that is not mind." Mahābalavān Bodhisattva said, "How does one preserve function? How does one contemplate it?" The Buddha said, "The non-duality of mind and matter is called preserving function. Internal practice and external practice, emerging and entering are non-dual; not abiding in a single mark, the mind is devoid of gain and loss; and into the stage of the one and non-one, the pure mind flows: this is called contemplating it."