金剛般若經疏論纂要 1.11

1.11

金剛者，梵云跋折羅，力士所執之杵是此寶也，金中最剛，故名金剛，帝釋有之，薄福者難見，極堅極利，喻般若焉，無物可能壞之，而能碎壞萬物。《涅槃經》云：「譬如金剛，無能壞者，而能碎壞一切諸物。」無著云：「金剛難壞。」又云：「金剛能斷。」又云：「金剛者，細牢故。細者，智因故。牢者，不可壞故。皆以堅喻般若體，利喻般若用。」又，真諦記說六種金剛：一、青色能消災厄，喻般若能除業障；二、黃色隨人所須，喻無漏功德；三、赤色對日出火，慧對本覺出無生智火；四、白色能清濁水，般若能清疑濁；五、空色令人空中行坐，慧破法執住真空理；六、碧色能消諸毒，慧除三毒傍兼可矣，非堅利之本喻。

As for 'Vajra', in Sanskrit it is vajra, which is the pestle held by a mighty warrior and is this jewel. It is the hardest among metals, hence it is called vajra. Śakra possesses it; those of little merit find it hard to see. It is extremely hard and extremely sharp, serving as a metaphor for prajñā: nothing can destroy it, yet it can crush and destroy myriad things. The Nirvāṇa Sūtra says: 'Just like vajra, which none can destroy, yet it can crush and destroy all things.' Asaṅga says: 'Vajra is hard to destroy.' He also says: 'Vajra is able to cut.' He also says: 'Vajra is so called because it is fine and firm.