金剛經纂要刊定記 4.301

4.301

云何下。結成疑也。前云：「一切賢聖通於三乘故」，疑聲聞得果是取。如初果人證自初果，亦自說言已證初果等。

"How could it be, etc." concludes by formulating the doubt. Above it was said: "Because all worthies and nobles encompass the three vehicles," one doubts whether śrāvakas' attainment of the fruits is grasping. For instance, a person of the first fruit realizes their own first fruit, and also says of themselves that they have already realized the first fruit, and so forth.