大乘起信論義記別記 1.12

1.12

第九、真如門約本義說，故文云「一切眾生本來常住入於涅槃。」無始覺之義，唯約修生說，以本無今有為始覺故。本覺之義，約修生本有說，以對始覺說本覺故，如文應知。「智淨相」等，約本有修生說，故文云「本覺隨染生二相故。」

Ninth, the aspect of tathatā is explained in terms of the fundamental meaning; therefore the text states: “All sentient beings originally abide constantly and enter into nirvāṇa.” The meaning of initial enlightenment is explained solely in terms of that which is produced through practice, because initial enlightenment takes what was originally absent and now exists as its meaning. The meaning of original enlightenment is explained in terms of what is originally possessed in relation to what is produced through practice, because original enlightenment is spoken of in contrast to initial enlightenment, as should be known according to the text. “The characteristic of the purity of wisdom” and so forth are explained in terms of what is produced through practice in relation to what is originally possessed; therefore the text states: “Original enlightenment, conforming to defilement, produces two characteristics.”