成唯識論述記 3.128

3.128

解行相、所緣中有二，初解所緣、行相；後解不可知言。初中復二，先略後廣，略即粗解體義，廣則料簡細解。「了謂了別」下，此為略解；「此中了者」下，此為廣解。略中有二，初解行；後解境。

In explaining the cognitive aspect and the cognitive object, there are two parts: first, explaining the cognitive object and cognitive aspect; second, explaining the word 'unknowable'. In the first there are again two parts: first brief, then detailed. The brief roughly explains the meaning of the entity, while the detailed critically analyzes and explains subtly. From 'discernment means discerning' below is the brief explanation; from 'here discernment...' below is the detailed explanation. In the brief there are two: first, explaining the activity; second, explaining the object.