俱舍論記 6.101

6.101

「若爾所緣至為相應因」者，問。若心、心所是相應因，所緣、行相別者，亦應更互為相應因。

"Regarding 'If so, then those whose objective support... serve as associated cause':" this is a question. If mind and mental factors are associated causes, then those with different objective supports (ālambana) and mental aspects (ākāra) should also mutually serve as associated causes.