俱舍論頌疏論本 27.47

27.47

後靜慮不動者，此無諍行依第四禪發，樂通行中此最勝故。言不動者，六無學中，唯不動性有無諍智，退法等五不能自防，況能息他諸煩惱諍？故唯不動。

'Based on the last dhyāna, of the immovable [type]': this practice of non-conflict is generated relying on the fourth dhyāna, because this is the most supreme among the practices of pleasant progress. As for 'immovable': among the six [classes of] those beyond training, only those of the immovable nature possess the cognition of non-conflict. The other five, such as those liable to fall away, cannot even protect themselves, how much less could they calm the conflict of others' afflictions? Therefore, it belongs only to the immovable.