楞伽阿跋多羅寶經註解 2.54

2.54

頭等七處息風所依，和合出聲而成言說。既依眾緣而生，則聲為妄矣，故有第二異不異問。佛答非異非不異者，但以分別為因起言說耳。又告異則妄想不應是因，不異則言說不應顯義，云何而有言說顯示？故曰非異非不異也。

The seven places such as the head are what the breath-wind relies upon, combining to produce sound and form speech. Since it arises in reliance upon multiple conditions, sound is false; hence there is the second question of difference and non-difference. The Buddha's answer that they are neither different nor not different is because speech merely arises taking discrimination as its cause. He also said that if they were different, discrimination could not be the cause; if they were not different, speech could not reveal meaning—how then could there be the revelation of speech? Therefore he says they are neither different nor not different.