成唯識論述記 5.939

5.939

述曰：既言三受容皆相應，故非憂受，以非無記故。五十七說，一根善、不善，以三性為境；二十二根中，又非餘法故。

The Commentary states: Since it states that all three sensations can be associated, it is therefore not the sensation of sorrow, because [sorrow] is not indeterminate. Fascicle Fifty-Seven states that one faculty is wholesome and unwholesome, taking the three natures as its cognitive object; among the twenty-two faculties, it is moreover no other factor.