成唯識論了義燈 1.101

1.101

或執離心，無別心所。本疏云：經部師云：唯三心所。又云：受、想、行、信、思等心所。《要集》云：如何得知立三、四等？見不引文，即云如何得知？如彼西明所引。何知本疏不見彼文？恐煩不引，徒設徵責。

"Or they grasp that apart from the mind there are no distinct mental factors (caitta)." The original Commentary states: 'The Sautrāntikas say: there are only three mental factors.' It also says: 'Feeling (vedanā), perception (saṃjñā), formations (saṃskāra), faith (śraddhā), volition (cetanā), and other mental factors.' The Essentials asks: 'How is it known that they establish three, four, etc.?' Seeing that it does not cite a text, it immediately asks how this is known, as cited by that master of Ximing. How does he know that the original Commentary did not see that text? Fearing prolixity, it did not cite it, so raising such an interrogation is futile.