大乘起信論義疏 1.45

1.45

自下第五明其遣言。「言真如者亦無有相」者，重題上言也。「謂言說之極」者，言語道斷而默不顯，其理絕名，故寄極表也。「因言遣言」者，上云極言，恐著理體，重遣於言也。

From here below, the fifth [topic] clarifies dispelling words. "Speaking of 'tathatā' also has no characteristics": this restates the statement above. "It is the limit of spoken explanations": when the path of language is cut off, silence does not reveal it, and its principle transcends names; hence it is expressed by relying on the ultimate. "Using words to dispel words": above, it spoke of ultimate words; fearing attachment to the principle's essence, it again dispels words.