瑜伽論記 4.61

4.61

初中，乃至第四定，云捨念清淨差別應知者，解差別有二：解通明四靜慮差別，如有尋有伺尋伺寂靜，喜寂靜，樂寂靜，捨念清淨等；二、解但對三禪以明差別，三禪亦有捨念不名淨，未離以上煩惱等故，第四靜慮由離障盡故，捨念得清淨名故，故云差別應知。

In the first part, up to the fourth dhyāna, regarding 'the distinction of the purity of equanimity and mindfulness should be known', there are two explanations of this distinction: first, it generally clarifies the distinctions of the four dhyānas, such as with investigation and with reflection, the stillness of investigation and reflection, the stillness of joy, the stillness of pleasure, and the purity of equanimity and mindfulness; second, it clarifies the distinction solely in contrast to the third dhyāna. The third dhyāna also has equanimity and mindfulness, but they are not called pure because it has not yet abandoned the afflictions of higher realms. The fourth dhyāna, because it has completely abandoned hindrances, obtains the name 'purity of equanimity and mindfulness'; hence it says 'the distinction should be known'.