瑜伽論記 6.38

6.38

無常苦等四想中有三：初明四種所作；次明四種所治；後明四種能治之法。

In the four perceptions of impermanence, suffering, and so forth, there are three parts: first, explaining the four tasks; next, explaining the four [states] to be counteracted; last, explaining the four dharmas that are antidotes.