廣弘明集 22.25

22.25

若謂利之為用亦可得分。則足可以執物。眼可以聽聲矣。若謂刀背亦有利兩邊亦有利。但未鍛而銛之耳。利若遍施四方。則利體無處復立。形方形直並不得施利。利之為用正在一邊毫毛處耳。神之與形舉體若合。又安得同乎。刀若舉體是利。神用隨體則分。若使刀之與利其理若一。則胛下亦可安眼。背上亦可施鼻。可乎。不可也。

If you say that the function of sharpness can also be divided, then feet could grasp objects and eyes could hear sounds. If you say that the back of the knife also has sharpness and both sides also have sharpness, but they have merely not been forged and whetted, [I reply that] if sharpness were applied across all four directions, the substance of sharpness would have nowhere to stand: square shapes and straight shapes alike could not be sharp. The function of sharpness resides precisely in a single edge as thin as a hair. If the spirit and the body correspond as an entire whole, how could they possibly be identical? If the knife throughout its entire substance were sharpness, the spirit's functions would divide according to the body. If the principles of the knife and sharpness were identical [to body and spirit], then eyes could also be placed beneath the shoulder blades, and a nose could also be installed on the back. Could this be? It could not.