Zen teachings - Pointing at the moon

Zen teachings can be likened to "the finger pointing at the moon".[101] Zen teachings point to the moon, awakening, "a realization of the unimpended interpenetration of the dharmadhatu".[102] But the Zen-tradition also warns against taking its teachings, the pointing finger, to be this insight itself:[103]
Wujin Chang, a nun, asked the Sixth Zen patriarch, Hui Neng, for help in understanding the Mahanirvana Sutra. The master answered that he could not read, but if the nun would read it aloud for him, he would do his best to help her.
The nun then asked, "If you can't even read the words, how can you understand the truth behind them?"
"Truth and words are unrelated. Truth can be compared to the moon," answered Hui Neng, pointing to the moon with his finger, "And words can be compared to a finger. I can use my finger to point out the moon, but my finger is not the moon, and you don't need my finger in order to be able to see the moon".[web 9][g]
This warning against confusing the finger and the moon resembles the Diamond-sutra:
[E]very disciple who is seeking Anuttara-samyak sambhodi should discard, not only conceptions of one's own selfhood, other selves, living beings and a Universal Selfhood, but should discard, also, all ideas about such conceptions and all ideas about the non-existence of such conceptions.
While the Tathagata, in his teaching, constantly makes use of conceptions and ideas about them, disciples should keep in mind the unreality of all such conceptions and ideas. [59]

Source: Wikipedia