俱舍論疏 10.142

10.142

論「謂生欲界至唯染污故」，答也。此明生欲界者未得色界善心，即是未得未至定等。此於欲界具成十八，具成善、染。若成上者唯是染污，成上惑故。染不緣下，由此初、二定唯八，喜、捨緣自地四境故。三、四定四，唯捨緣四境故。四無色一，唯捨緣一法故。「皆不緣下唯染污故」，釋所以也。

[On the Śāstra's statement:] 'Namely, those born in the desire realm [up to] because they are solely defiled', this is the answer. This explains that one born in the desire realm who has not yet attained a wholesome mind of the form realm—that is, has not yet attained the threshold dhyāna and so forth—possesses all eighteen in the desire realm, possessing both wholesome and defiled. If one possesses those of the upper realms, they are solely defiled, because one possesses upper defilements. Defilements do not take lower realms as objects; hence, the first and second dhyānas have only eight, joy and equanimity taking the four objects of their own stage; the third and fourth dhyānas have four, solely equanimity taking the four objects; the four formless absorptions have one, solely equanimity taking one dharma-object. 'None of them takes lower realms as objects because they are solely defiled' explains the reason.