俱舍論頌疏論本 2.58

2.58

問：「何故名同分、彼同分耶？」答：「此有三解。第一解云：根、境、識三更相交涉，故名為分。同有交涉分，故名同分。第二解云：或復分者是已作用。作自業者，名己作業。同有作用分，故名同分。第三解云：或復分者是所生觸，三和生觸，同有生觸，故名同分。彼同分者，論云：『由非同分與彼同分種類分同，名彼同分。』解云：如不見色眼名非同分。此非同分與彼見色眼種類分同，名彼同分。言種類分同者，同眼自性故，互相引起故，又相繫屬故。」

Question: "Why are they called sabhāga and tatsabhāga?" Answer: "There are three explanations for this. The first explanation says: The three—faculty, object, and consciousness—interact with one another; hence they are called bhāga (portion/share). Since they equally share in this interaction, they are called sabhāga. The second explanation says: Or alternatively, bhāga is their own function (kāritra). Performing one's own activity is called performing one's own work. Since they equally possess a functional share, they are called sabhāga. The third explanation says: Or alternatively, bhāga is the contact (sparśa) produced. When the three assemble, they produce contact; since they equally produce contact, they are called sabhāga. Regarding tatsabhāga, the treatise says: 'Because the non-sabhāga shares the same generic class with that which is sabhāga, it is called tatsabhāga.' The explanation says: For example, an eye that does not see visible form is called non-sabhāga. This non-sabhāga shares the generic class with that eye which sees visible form; hence it is called tatsabhāga. That they 'share the generic class' means: they share the same self-nature of the eye, they mutually induce one another, and they are mutually connected."