大般涅槃經集解 18.115

18.115

案道生曰：除結惑之䨱為掘。見佛性故，為出金藏也。僧亮曰：偏說無常，常我自顯也。法瑤曰：說涅槃之教，顯明佛性以示物也。僧宗曰：性不在他，惑除必見，義稱於家而掘出也。

Daosheng comments: Removing the cover of fetters and confusion is 'digging.' Because the buddhadhātu is seen, this is 'bringing forth the gold treasure.' Sengliang comments: By exclusively teaching impermanence, the eternal ātman naturally becomes apparent. Fayao comments: He expounds the teaching of nirvāṇa, making manifest the buddhadhātu to reveal it to beings. Sengzong comments: The nature does not exist in something else; once delusion is eliminated, it is definitely seen—in sense, this is called 'digging it out in one's own house.'