釋禪波羅蜜次第法門 5.76

5.76

答曰：二法雖在一心，二相不俱，謂覺時觀不明了，觀時覺不明了。譬如撞鐘，鐘聲雖一，而麁細有異。一心中覺觀亦如是。復次，身根、身識相應，名為覺；意根、意識相應，名為觀。身識是外鈍，故名麁；意識是內利，故能分別名細。此雖同緣一觸，而二相不俱，故為觀支。

Answer: Although the two dharmas are in a single mind, their two characteristics are not concurrent; that is to say, when vitarka is present, vicāra is not clear, and when vicāra is present, vitarka is not clear. For example, when striking a bell, although the bell's sound is one, there is a difference between coarse and subtle. Vitarka and vicāra in a single mind are also like this. Furthermore, correspondence with the body faculty and body consciousness is named vitarka; correspondence with the mental faculty and mental consciousness is named vicāra. Body consciousness is external and dull, hence it is called coarse; mental consciousness is internal and sharp, hence it can discriminate and is called subtle. Although these concurrently take the same sensation as their object, their two characteristics are not concurrent; hence it constitutes the factor of vicāra.