淨名經集解關中疏 2.43

2.43

又問。此病身合耶心合耶　二約身心問。肇曰。或者聞病不可見。將謂心病無形故不可見。或謂身病微細故不可見。為之生問也。病於身心與何事合而云不可見。

He asked again: "Is this illness conjoined with the body, or is it conjoined with the mind?" Second, he inquires with reference to body and mind. [Seng]zhao says: "Some, hearing that the illness cannot be seen, might suppose that because mental illness is formless, it cannot be seen; or they might suppose that because physical illness is subtle, it cannot be seen. For this reason, the question arises: with what thing in the body or mind is the illness conjoined, such that you say it cannot be seen?"