瑜伽論記 1.78

1.78

Regarding "associated with samādhi" (samādhisaṃprayukta), although the Commentary explains it, it has not yet exhausted [its meaning]. The intent is to show that the essential nature of the stage of samāhita (meditative equipoise) and the like extends across all five aggregates. If one merely said "samādhi" without saying "associated with", it would refer solely to a single mental factor of concentration (ekāgratā) and would not be able to show that its essential nature extends across the five aggregates. Therefore, the word "associated with" is stated to show that its breadth is identical with the stage of meditative equipoise; this is because they share the same essential nature in horizontally extending across the five aggregates, not because they are identical in vertically extending through the three realms.