俱舍論頌疏論本 7.54

7.54

釋曰：三界善心各分二種，謂加行得、生得別故。欲界無覆分為四心：一異熟生、二威儀路、三工巧處、四通果心。色界無覆分為三種，除工巧處，上界都無造作種種工巧事故。於無色界，無覆唯一，謂異熟生。故前無覆合成八種。如是十二為二十心，謂欲界八，二善、二染、四無記心也。色界六種，前八心上，除不善、工巧二也。無色界四，於前六上，更除威儀、通果二心也。兼、學無學，故成二十。

The commentary says: The wholesome minds of the three realms are each divided into two kinds, distinguished into acquired through preparation and innate. The unimpeded of the desire realm is divided into four minds: first, born of maturation; second, the paths of deportment; third, the fields of craft; fourth, the mind of the fruit of supernormal power. The unimpeded of the form realm is divided into three kinds, excluding the fields of craft, because in the higher realm there are no activities of producing various crafts. In the formless realm, the unimpeded is only one, namely, born of maturation. Thus, the unimpeded [minds] discussed before combine to make eight kinds. In this way, the twelve become twenty minds, namely: eight of the desire realm: two wholesome, two defiled, and four neutral minds; six kinds of the form realm: from the preceding eight minds, unwholesome and craft, these two, are excluded; four of the formless realm: from the preceding six, deportment and the fruit of supernormal power, these two minds, are further excluded. Together with the learner and non-learner, they therefore make twenty.