大方廣佛華嚴經隨疏演義鈔 34.66

34.66

疏「瞥起亦非真知」者，此釋第二句，遣北宗之病也。北宗以不起心為玄妙，故以集起名心，起心看心是即妄想，故非真知。是以真知必忘心遺照、言思道斷矣。故《勝天王般若》「問云：『云何菩薩修學甚深般若通達法界？』佛告勝天王言：『大王！即是如實。』『世尊！云何如實？』『大王！即不變異。』『世尊！云何不變異？』『大王！所謂如如。』『世尊！云何如如？』『大王！此可智知，非言能說。離相無相，遠離思量，過覺觀境，是謂菩薩修行甚深般若，了達甚深法界。』」釋曰：但以無念心稱此而知，即同佛知見。經云「如實即無念」，是用無念心見聞覺知，覺知一切事法，心常寂靜，即如來藏。

Regarding the Commentary's "Sudden arising is also not true knowing," this explains the second line and removes the defect of the Northern lineage. The Northern lineage takes the non-arising of mind as the profound and subtle, so it designates the gathering of arisings as mind, and giving rise to mind to observe mind is precisely false conceptualization, hence it is not true knowing. Therefore, true knowing must forget mind and abandon illumination, where the paths of words and thought are cut off. Thus the Prajñāpāramitā Sūtra of King Pravarasena asks: "'How does a bodhisattva practice and train in profound prajñā and penetrate the dharmadhātu?' The Buddha told King Pravarasena: 'Great King! It is precisely yathābhūtam.' 'World-Honoured One! What is yathābhūtam?' 'Great King! It is being unchanging.' 'World-Honoured One! What is being unchanging?' 'Great King! It is so-called tathatā.' 'World-Honoured One! What is tathatā?' 'Great King! This can be known by wisdom, not expounded by words. Free from marks and signless, far removed from deliberation, transcending the sphere of vitarka and vicāra—this is called a bodhisattva practicing profound prajñā and fully penetrating the profound dharmadhātu.'" Explanation: Merely by knowing in accordance with this with a mind free of thought, one is identical with the Buddha's knowledge and vision. The sūtra says: "Yathābhūtam is precisely thoughtlessness"; using a thoughtless mind to see, hear, perceive, and know, one perceives and knows all phenomenal dharmas while the mind is ever tranquil: this is the tathāgatagarbha.