成唯識論述記 6.474

6.474

述曰：別解六位。諸心所中辨三門訖，此當第四，初結前、問後，如文可知；次舉頌等。

The Commentary states: Specifically explaining the six categories. Among the mental factors, having concluded the analysis of the three gates, this is the fourth. First, concluding what preceded and inquiring about what follows, as can be understood from the text; next, raising the verse and so forth.