俱舍論記 29.19

29.19

「此四無量至入捨等至」者，釋第五、第六、第七句，明四行相。慈謂與樂，悲謂拔苦，喜謂喜慰，捨謂平等。

"These four immeasurables [...] enter the absorption of equanimity" explains the fifth, sixth, and seventh lines, clarifying the four mental aspects: benevolence means conferring happiness, compassion means eliminating suffering, sympathetic joy means joyful comfort, and equanimity means impartiality.