大方廣圓覺修多羅了義經略疏 2.908

2.908

然毀者是彼，說者是我。經文於毀者言無，反明過也。於說法者言有，順明過也。翻覆推過者，下擬決斷為病故。

However, the defamer is the other, and the preacher is oneself. The sūtra text speaks of 'none' regarding the defamer, which clarifies the fault by negation. It speaks of 'there is' regarding the preacher of Dharma, which clarifies the fault directly. Examining the fault back and forth is because it intends below to decisively judge it as a disease.