注大乘入楞伽經 4.66

4.66

因上言說能顯義，故大慧問為言說是第一義？為所說是第一義？并重舉上第一義心法以請問。而佛答言：非言語是，亦非所說。何以故？第一義者是自證聖智三昧樂境，因言而入非即是言。是故言殺如標月指，若復見月，了知所標畢竟非月。

Because it was said above that speech can reveal meaning, Mahāmati asks whether speech is the paramārtha-satya, or whether that which is spoken is the paramārtha-satya, and again brings forward the mind-dharma of the paramārtha to inquire. But the Buddha answers, saying: Words are not it, nor is that which is spoken. Why? The paramārtha is the realm of the bliss of samādhi realized inwardly by noble wisdom; one enters by means of words, but it is not words themselves. Therefore, speech is like a finger pointing at the moon; if one sees the moon, one thoroughly knows that what points to it is definitively not the moon.