起信論疏筆削記 9.3

9.3

以對等者，下云：當知染法淨法皆悉相待。今此且約對於新生立為本有，以始覺從修新生、本覺性自元有，由是對始以立於本。又以下，約別義釋。前約對始名本，今約生始名本。原其始覺是本所生，內因熏習、外假緣力，創然而有，故名為始，生於始故名為本也。苟無所生，亦不名本，如女生子，方得母稱。

Regarding "by contrast with" and what follows: the text below states: "One should know that defiled dharmas and pure dharmas are entirely relative to each other." Here, it is temporarily established as inherently existing by contrast with newly arisen [enlightenment]. Because actualized enlightenment newly arises through cultivation, whereas original enlightenment is inherently and primordially present by its nature, the "original" is established by contrast with the "actualized". Regarding "furthermore" and what follows: explaining according to a distinct meaning. The preceding part explained the name "original" by contrast with the "actualized"; this part explains the name "original" because it generates the "actualized". Tracing its source, actualized enlightenment is generated by the original: with internal vāsanā as cause and external conditions as supportive power, it bursts forth into existence and is therefore named "actualized"; because it generates the actualized, it is named "original". If there were nothing generated, it would not be called "original", just as a woman can receive the title of "mother" only after giving birth to a child.