瑜伽師地論略纂 12.201

12.201

論解靜慮、解脫雜染有二種。清淨有四種，與上相違，應知其相者，與雜染二種相違也，雜染二種中各有二故。初染二者：一、無功行；二、諸蓋現前。第二染二者：一、自地煩惱纏；二、自地隨眠。此謂有因，有此二染障。如來得清淨時，有四種清淨，翻前應知。

The treatise explains that defilements of absorption (dhyāna) and liberation (vimokṣa) are of two kinds. "Purifications are of four kinds; their characteristics should be understood as contrary to the above" means contrary to the two kinds of defilement, because there are two within each of the two kinds of defilement. The first defilement's two are: first, absence of exertion; second, the active presence of hindrances. The second defilement's two are: first, the entanglements of afflictions belonging to one's own stage; second, the latencies belonging to one's own stage. This means that there being causes, there are these two defiling obstructions. When the Tathāgata attains purification, there are four kinds of purification, which should be understood by reversing the preceding.