金剛經纂要刊定記 2.112

2.112

From 'The Nirvāṇa...' downward cites a sūtra. From 'Asaṅga...' downward cites a treatise. 'Difficult to destroy' is the meaning of hardness. 'Able to sever' is the meaning of sharpness. Regarding 'subtle and firm': 'Subtle' sets apart what is coarse to reveal what is exquisite; 'firm' sets apart what can be destroyed, establishing the meaning of solid durability. The cause of jñāna is indeed prajñā: prajñā is the cause of jñāna, and jñāna is the fruit of prajñā. This is spoken in terms of contemplative prajñā. Because it is subtle, it can penetrate afflictions and cause them to be eliminated.