俱舍論頌疏論本 24.33

24.33

成由一念雜者，雜修定成，由一念雜，謂阿羅漢或是不還，彼必先入第四靜慮，多念無漏相續現前，從此引生多念有漏，後復多念無漏現前，如是旋還，後後漸減，及至最後二念無漏。次引二念有漏現前，無間後生二念無漏，名雜修定加行成滿。次復唯有一念無漏，次復引起一念有漏，無間後生一念無漏，中間有漏、前後無漏以相間雜，故名雜修。此一念雜，名根本成。修第四已，乘此勢力亦能雜修下三靜慮。

As for 'its accomplishment is through the mixing of single moments': the accomplishment of mixed dhyāna is through the mixing of single moments. That is, an arhat or an anāgāmin must first enter the fourth dhyāna, where multiple moments of uncontaminated [mind] present themselves in succession; from this, multiple moments of contaminated [mind] are induced; after that, multiple moments of uncontaminated [mind] again present themselves. Rotating back and forth in this way, the subsequent ones gradually decrease, down to the final two moments of uncontaminated [mind]. Next, two moments of contaminated [mind] are induced and presented, followed immediately by the arising of two moments of uncontaminated [mind]—this is called the complete fulfillment of the preparatory stage of mixed dhyāna cultivation. Next, there is only a single moment of uncontaminated [mind], which then induces a single moment of contaminated [mind], followed immediately by the arising of a single moment of uncontaminated [mind]. With the contaminated [mind] in between and the uncontaminated [mind] before and after intermixed with each other, it is therefore called mixed cultivation. This mixing of single moments is called the accomplishment of the fundamental [state]. Having cultivated the fourth, by the momentum of this, one is also able to cultivatively mix the lower three dhyānas.