大乘起信論裂網疏 3.70

3.70

心性，通指八識心王及諸心所之性，即是真如不變性也。無明，即指第七識相應之微細法癡，不如實知真法一也。染心相現，通指八識心王及諸心所，皆有四分依他相起也。而常明潔無有改變者，心王、心所各各四分，既皆全攬真如為體，真如隨緣不變，故常明潔，如金作諸器，諸器皆金也。復以本性無分別故等者，偏指心王、心所所變相分，亦以心性為體，全體心性曾無變易，決無心外之境界也。

'Mind-nature' refers broadly to the nature of the mind-kings of the eight consciousnesses and the various mental factors; that is, the immutable nature of tathatā. 'Ignorance' refers precisely to the subtle delusion regarding phenomena associated with the seventh consciousness, not truly knowing that the true Dharma is one. 'The marks of a defiled mind appear' refers broadly to the mind-kings of the eight consciousnesses and the various mental factors, all having the four aspects arising in other-dependent fashion. 'Constantly luminous and clean, without alteration': since the four aspects of each mind-king and mental factor all fully grasp tathatā as their essence, and tathatā accords with conditions yet is immutable, they are constantly luminous and clean, like gold being made into various vessels, where all vessels remain gold. 'Furthermore, because its original nature is free from discrimination', etc., specifically refers to the objective aspects transformed by the mind-kings and mental factors, which also take the mind-nature as their essence; the entire essence of the mind-nature has never undergone any change, and there are decidedly no sense-realms outside the mind.