大乘起信論別記 1.148

1.148

言「即心不覺常無別異」者，此明無體等義，以離心外無別煩惱數法差別，故言即心不覺常無別異。既無體等，餘二何寄？由是不有同知同緣，故言「不同知相緣相故。」

The phrase "identical to mind, non-enlightened, and always without distinction" explains the absence of the equality of essence: because apart from mind there is no distinct difference of mental factor dharmas, it is said that "identical to mind, non-enlightened, and always without distinction." Since there is no equality of essence, whereon could the other two depend? For this reason there is no shared cognition or shared object; hence it says: "because they do not share the same cognitive characteristic or objective characteristic."