金光明經文句記 2.58

2.58

二、「斯乃」下，明用犯意。指上三人久住性染無染法門，能現修染，故得名為非欲之欲；而令眾生即欲悟性，故得名為以欲止欲。諭以屑者，字應作榍，又作楔同。《說文》云「楔，櫼也。櫼，子林切。」出前櫼者必假後櫼，故云以楔出楔也。將聲止聲者，《大論》第七云「譬如執事比丘舉手唱言：『眾皆寂靜。』是為以聲遮聲，非求聲也。」

Second, from "This is indeed" downward, explaining the intent behind using transgression. This refers to the aforementioned three persons who have long abided in the Dharma-door of inherent defilement and non-defilement; being able to manifest the practice of defilement, they are therefore called "desire that is non-desire"; and causing sentient beings to awaken to the nature right within desire, it is therefore called "using desire to stop desire." The analogy of the pin (xie): the character should be written as xie (榍), and is also written as wedge (xie 楔). The Shuowen says: "A wedge is a peg (jian). Jian is pronounced zi and lin cut." To drive out a former peg, one must rely on a latter peg; hence it is called "driving out a wedge with a wedge." "Using sound to stop sound": the seventh fascicle of the Da zhidu lun says, "It is like an administrative monk who raises his hand and calls out, 'All in the assembly, be silent!' This is using sound to block sound, not seeking sound."