成唯識論述記 3.792

3.792

述曰：假、實通說有二十一，謂不放逸、捨及不害體假有故。若實而論唯有十八，不放逸、捨皆三善根精進少分；不害，無嗔善根分故。謂遍行、別境此二各五，并善十一，故二十一也。何故與遍行心所相應也？

The Commentary states: Speaking generally of nominal and real, there are twenty-one, because non-negligence, equanimity, and non-harming are nominally existent in substance. If discussed in terms of real [entities], there are only eighteen: non-negligence and equanimity are both portions of the three wholesome roots and vigor; non-harming is a portion of the wholesome root of non-anger. That is, the universal and the particular-determination factors are five each, together with the eleven wholesome ones, making twenty-one. Why is it associated with universal mental factors?