瑜伽論記 18.117

18.117

略中，問答難通。言若內、外、中間、若離諸蘊，不可得者，汝所計我於內根外塵中間六識十八界中，處處推尋我不可得。又解：自相續名內，他相續及外器名外，非內非外名中間。應立量云：汝所立我決定是無以不可得如空華等，謂如眼等至都不可見者，如眼等實有各有業用可見，計我業用都不可見。立量云：汝所計我體用俱無以不可見，猶如兔角。

In the brief section, questions and answers resolve difficulties. As for "whether internal, external, intermediate, or apart from the aggregates, it is unobtainable": regarding the self imputed by you, when investigating everywhere among the internal sense-faculties, the external dust-objects, and the intermediate six consciousnesses—the eighteen dhatus—the self is unobtainable. Another explanation is: one's own continuum is called internal, other continuums and the external receptacle-world are called external, and what is neither internal nor external is called intermediate. A formal argument (prayogavākya) should be established: "The self posited by you is definitively non-existent; because it is unobtainable; like a flower in the sky." Regarding "as with the eyes and so on, up to... it is utterly invisible": real entities such as the eyes and so on each have observable actions and functions, but the actions and functions of the imputed self are utterly invisible. The formal argument should be established: "The self posited by you lacks both substance and function; because it is invisible; like the horn of a hare."