俱舍論疏 2.115

2.115

「論曰至恒名同分」，長行文中有三：一明法界唯同分、二明十七通二種、三明同分等義。此即初也。言「法同分者」，牒頌文也。「謂一法界唯是同分」，釋頌意也。言「若境與識至說名同分」，釋境同分義也。若境簡六根、六識，定為所緣，簡外五境。五境雖二識緣，對其五識為定所緣，不對意識。法界對其意識為定所緣，不對餘識。故《正理》云「且如法界與彼意識為定所緣，是不共故。」准此，故知五境是共，非定所緣。然望五識為定所緣，五識於餘不能緣故。由此法界已、正、當生無邊意識，故名同分。餘十七界雖已、正、當生無邊意識，不名同分。已生謂過，現生法謂未來正生及當生也。言「無一法界至無邊意識」者，釋唯同分。言「由諸聖者至恒名同分」者，指事釋也，如文可解。

On "The Śāstra says [...] is always called a counterpart": within the prose text there are three parts: first, explaining that the dharmadhātu is exclusively a counterpart; second, explaining that seventeen [dhātus] are of both kinds; third, explaining the meaning of counterpart and so forth. This is the first part. The words "as for the counterpart dharma" take up the words of the verse. "Meaning that the single dharmadhātu is exclusively a counterpart" explains the intention of the verse. The words "if an object and a consciousness [...] it is said to be a counterpart" explain the meaning of an object as counterpart. "If an object" excludes the six sense-faculties and six consciousnesses; "determinate cognitive object" excludes the five external objects. Although the five objects are cognised by two consciousnesses, they are determinate cognitive objects with respect to the five consciousnesses, not with respect to mental consciousness. The dharmadhātu is a determinate cognitive object with respect to mental consciousness, not with respect to the other consciousnesses. Thus the Nyāyānusāra says: "For example, the dharmadhātu is the determinate cognitive object of mental consciousness because it is uncommon." According to this, we know that the five objects are common, not determinate cognitive objects. However, with respect to the five consciousnesses they are determinate cognitive objects, because the five consciousnesses cannot cognise anything else. For this reason, because the dharmadhātu has produced, is currently producing, and will produce boundless mental consciousnesses, it is called a counterpart. Although the other seventeen dhātus have also produced, are currently producing, and will produce boundless mental consciousnesses, they are not called counterparts. "Already produced" refers to the past; "presently producing dharmas" refers to those in the future currently being produced and those destined to be produced. The words "there is not a single dharmadhātu [...] boundless mental consciousnesses" explain why it is exclusively a counterpart. The words "because all the noble ones [...] is always called a counterpart" explain by pointing to instances; it is understandable from the text.