成唯識論演祕 2.177

2.177

彼以總身一分形色而能表示自發業心，故說形色名為身表，身所造業名為自業。故《成業論》云：「此中有說，且身表業形色為性。誰之形色？謂身形色。若身形色，何故前言身所造業故名身業？謂總名身一分攝故，名身形色；依身大種而發生故，名身所造。以總身言於別亦轉，此能表示自發業心令他知故。為顯此義，故說頌言：由外發身、語，表內心所思，譬彼潛淵魚，鼓波而自表。形色者何？謂長等性。何者長等？謂於彼生長等名想，此色處攝。」

They take a part of the whole body—namely, shape-matter—as that which can express the mind that initiates karma by itself; therefore, they state that shape-matter is called bodily communicative action (kāya-vijñapti), and that the karma generated by the body is called its own karma. Thus the Karmasiddhi-prakaraṇa states: 'Herein, some say: To begin with, bodily communicative action has shape-matter as its nature. The shape-matter of what? Namely, the shape-matter of the body. If it is the shape-matter of the body, why was it previously said that karma generated by the body is called bodily karma? Because it is subsumed under a part of the general name ‘body’, it is called the shape-matter of the body; because it arises dependent on the great elements of the body, it is called generated by the body. For the general word ‘body’ also applies to its parts; this can express the mind that initiates karma by itself so as to make others know it. To clarify this meaning, it is stated in verse: Dependent on the external initiating of body and speech, / it expresses the thought of the inner mind; / just as a fish hidden in the deep / reveals itself by stirring the waves. What is shape-matter? Namely, the nature of long, etc. What are long, etc.? Namely, that regarding which the name and notion of long, etc., arise; this is subsumed under the sphere of form (rūpāyatana).'