俱舍論頌疏論本 6.57

6.57

等流似自因者，謂等流果皆似自因，謂似同類遍行因故。

'Outflow resembles its own cause' means that the outflow result always resembles its own cause, namely resembling the similar cause (sabhāga-hetu) and universal cause (sarvatraga-hetu).