俱舍論頌疏論本 3.33

3.33

"Elsewhere, this is called gladness" means: excluding the third dhyāna, in the lower three stages it is called "elsewhere" (the lower three stages are the desire realm, the first dhyāna, and the second dhyāna). "This" refers to this mind of the sixth consciousness; that is to say, the pleasure of this mind in the lower three stages is called the gladness faculty (saumanasyendriya). In the third dhyāna, mental pleasure is tranquil and serene because it is separated from the craving for joy; therefore, it is exclusively called the pleasure faculty. In the lower three stages, mental pleasure is coarse and active because there is craving for joy; therefore, it is exclusively called the gladness faculty.