大乘起信論義記 3.64

3.64

又前三麁中，後二謂不斷相應及分別智相應染，是麁心之中稍細，故云麁中之細也。細中之麁者，後三染心俱名為細，於中前二謂能見能現是也。同是不相應故名為細，形後根本業識故復云麁，此是十地已還菩薩位中所知境也。

Furthermore, among the former three coarse ones, the latter two—namely the continuation-conjoined and the discriminating-knowledge-conjoined defilements—are somewhat subtle within the coarse mind, hence they are called 'the subtlest among the coarse'. Regarding 'the coarsest among the subtle': the latter three defiled minds are all called subtle; among them, the former two, namely the ability to perceive and the ability to manifest, are these. Being equally unconjoined, they are called subtle; compared with the subsequent fundamental karmic consciousness, they are again called coarse. These are the realms known in the stages of bodhisattvas on or below the ten grounds.