瑜伽論記 20.137

20.137

八明三種思惟過患。謂不究竟思惟者，思惟苦行等為涅槃因，不能究竟得至涅槃。非處思惟者，思惟於我有邊無邊等，不應思處而起思惟名為非處。顛倒思惟者，於苦無常不淨等中思惟常樂淨等名顛倒思惟。

Eighth, explaining the faults of the three kinds of reflection. "Reflection that is not ultimate" means reflecting on ascetic practices and the like as the cause of nirvāṇa, unable to ultimately reach nirvāṇa. "Improper reflection" means reflecting on the self as having an end, having no end, and so on; giving rise to reflection on what should not be reflected upon is called improper reflection. "Inverted reflection" means reflecting on permanence, bliss, purity, and so on with respect to suffering, impermanence, and impurity; this is called inverted reflection.