成唯識論演祕 6.305

6.305

略為二釋：一云，「依」、「於」俱第七轉。疏云「者」、「義」是助辭矣；非說依者是彼於義。依若於義，云何得言俱第七轉？體無二故，不可言俱。二云，「依」、「於」有同有別，如「根」、「境」者，「依」、「於」不同，言「依」語處立隨說因「依即於義」，今依彼因云「依於義」，對「依」、「於」名云俱第七，更思。

There are briefly two explanations: The first says: "yi" and "yu" are both the seventh case ending. The Commentary's words "zhe" and "yi" are auxiliary words; it does not say that "yi-zhe" is the meaning of that "yu." If "yi" were the meaning of "yu," how could one say "both have the seventh case ending"? Because the substance is not dual, one cannot say "both." The second says: "yi" and "yu" have sameness and difference. Just as with "faculties" and "objects," "yi" and "yu" are not the same; stating "relying on (yi) the basis of speech, the conventional cause is established," "relying on (yi)" is precisely the meaning of "in (yu)"; now, relying on that cause, it is called "relying on in its meaning" (yi yu yi); with respect to the terms "yi" and "yu," it says they both have the seventh [case ending]. One should consider this further.