瑜伽論記 7.509

7.509

後、正明觀，於中有二：初、明二種作意修不淨觀；後不非修習已下，明此觀門非頓觀察。前中，先、作假想勝解；次、當趣入真實作意。

Next, it directly clarifies insight. Here there are two parts: first, clarifying the two kinds of attention that cultivate the contemplation of impurity; after that, from "it is not the case that by cultivating..." onward, clarifying that this gateway of contemplation does not involve sudden observation [of all]. In the former part: first, one produces an imaginative resolute intention; next, one should enter into authentic attention.