成唯識論述記 7.298

7.298

述曰：第三段中第八義也。善定引故唯善，非在上、下地，與前報說義同也，此釋唯屬第四定因。

The Commentary states: Within the third section, this is the eighth meaning. Because it is induced by a wholesome attainment, it is exclusively wholesome. That it is not in the higher or lower grounds is identical in meaning with the previous explanation of retribution; this explains the reason it belongs exclusively to the fourth dhyāna.