大乘起信論義記 2.41

2.41

初中疑云：既絕名相但假立客名者，何故不立餘名而唯云真如耶？釋云：真如者，是言說之極，謂此名之後，更無有名；則諸名之中，最後邊際故。《攝論》中十種名內，真如名是第十究竟名，故云極也。因言遣言者，立此極名，為遣於名。若無此名，無以遣名；若存此名，亦不遣名。如打靜聲，若無此聲則不止餘聲；若為存此聲，數數打靜，即自喧故，亦非止聲。當知此中意趣亦爾，善須消息。

In the first part, the doubter asks: "Since it cuts off names and marks and only provisionally establishes a guest name, why not establish other names instead of only saying 'tathatā'?" In explanation, [the author] says: "Tathatā" is the utmost limit of verbal expression, meaning that after this name there is no further name; it is the final boundary among all names. Among the ten kinds of names in the Mahāyānasaṃgraha, the name tathatā is the tenth, ultimate name, hence called the "limit." "Using words to eliminate words" means establishing this ultimate name in order to eliminate names. Without this name, there would be no way to eliminate names; but if one holds on to this name, names are likewise not eliminated. Like striking a sounding-block to call for silence: without this sound, other sounds would not be stopped; but if, in order to preserve this sound, one repeatedly strikes for silence, it becomes noisy itself and thus fails to stop sounds. One should know that the intent here is also like this; it must be carefully discerned.