四明十義書 1.84

1.84

良由上人殊不知陰入境與不思議境分於能觀所觀，用藥治病之義故也。

This is simply because you, Venerable Sir, completely fail to understand the distinction between the capable of contemplating and the contemplated object, and the meaning of applying medicine to cure illness, between the object of the aggregates and sense-bases and the inconceivable object.