成唯識論述記 8.536

8.536

述曰：十二少分苦苦所攝，有何所以一切支中有苦受故。彼第十云：「謂苦受俱行支及非受俱行支一分是苦苦」，前苦受俱行中，攝十一，除受，如前說。今并受亦是苦苦，故十二支。言一分者，如壞苦說。

The Commentary states: A portion of the twelve is subsumed under the suffering of suffering. What is the reason? Because there is painful sensation in all links. Fascicle 10 of that text says: 'A link operating in conjunction with painful sensation and a portion of the links not conjoined with sensation are the suffering of suffering.' In the previous [discussion of] operating in conjunction with painful sensation, eleven were included, excluding sensation, as stated before. Now including sensation, it is also the suffering of suffering, so there are twelve links. The words 'a portion' are explained just as in the suffering of change.