瑜伽論記 6.39

6.39

此下餘八所治及能治法，即出家後設生喜樂有懶墮懈怠等為四，遠離閑居於止觀品有暗昧心等為四。故於出家中於四種所作事中，起四種障，為除此故修無常等四想。

Below this, the remaining eight states to be counteracted and their antidotal dharmas are: after renouncing, even if joy arises, there are sluggishness, indolence, and so forth, which make four; and in secluded dwelling in solitude, in the class of tranquility and insight there is a darkened mind and so forth, which make four. Therefore, among the renunciants, with respect to the four tasks, four kinds of obstacles arise; to eliminate them, one cultivates the four perceptions of impermanence and so forth.