俱舍論記 6.107

6.107

「相應因體至義何差別」者，問二因別。相應因狹，唯心、心所。若俱有因寬，通諸有為。若是相應因定是俱有因，有是俱有因非相應因，除心、心所餘有為法。此中以狹問寬：若相應因體即俱有因，如是二因義何差別？

"Regarding 'The intrinsic nature of the associated cause... what distinction in meaning is there?':" this inquires about the difference between the two causes. The associated cause is narrower, being only mind and mental factors. The co-existent cause (sahabhū-hetu) is broader, extending to all conditioned phenomena. Whatever is an associated cause is definitively a co-existent cause; there are co-existent causes that are not associated causes, excluding mind and mental factors, namely the remaining conditioned phenomena. Here, the narrower is used to question the broader: If the intrinsic nature of the associated cause is precisely the co-existent cause, what distinction in meaning is there between these two causes?