首楞嚴義疏注經 6.256

6.256

月光童子因作水觀，見身中水與外香水性合真空，一味流通，得無生忍。今謂此觀不離尋、伺、想、念，豈是真實如如之性。覺觀，即尋伺也。

The youth Candrabhāga, through the water contemplation, saw that the water in his body and the external scented water merged in nature with true emptiness, flowing with one flavor, and attained the forbearance of non-arising dharmas. Here it means: this contemplation does not depart from vitarka, vicāra, samjñā, and thought; how could it be the real nature of thusness? 'Discursive contemplation' (jueguan) refers to vitarka and vicāra.