俱舍論記 6.218

6.218

「同類遍行至皆似因故」者，釋第三句。若同類因，唯取自界、自地、自部、自性等流果。若遍行因，唯取自界、自地、自性、染污等流果。此二因所得果皆似因故，故因雖二，其果唯一。問：如邪見生有身見，雖性不同，同是染故，為等流果。善生無覆，雖性不同，同是淨故，應是等流果。解云：染法易同故得為果，淨法難同故不為果。

Regarding "Homogeneous and omnipresent [causes] ... because they all resemble the cause": it explains the third line. If it is a homogeneous cause, it takes only an outflow fruit of its own realm, its own stage, its own category, and its own nature. If it is an omnipresent cause, it takes only a defiled outflow fruit of its own realm, its own stage, and its own nature. Because the fruits obtained by these two causes all resemble the cause, therefore although the causes are two, their fruit is solely one. Question: Just as false view produces the view of self-existence, although their natures are different, because they are equally defiled, it is an outflow fruit. Wholesome produces unobstructed indeterminate; although their natures are different, because they are equally pure, shouldn't it be an outflow fruit? Explanation: Defiled phenomena easily resemble each other, hence they can be fruits; pure phenomena do not easily resemble each other, hence they cannot be fruits.