注維摩詰經 2.266

2.266

肇曰：覺觀麁心，言語之本。真法無相故覺觀自離，覺觀既離則無復言說。二禪以上以無覺觀故，故稱聖賢默然也。

[Seng]zhao says: "Coarse and subtle thought are the coarse mind, the basis of speech. The true Dharma has no characteristics, so coarse and subtle thought are naturally cast off; once coarse and subtle thought are cast off, there is no longer verbal exposition. In the second dhyāna and above, because there is no coarse and subtle thought, it is therefore called the silence of the noble ones."