俱舍論記 4.57

4.57

「輕安者謂心堪任性」者，輕安謂能令心於善有所堪任。故《正理》云「正作意轉，身、心輕利安適之因。心堪任性，說名輕安。」又《入阿毘達摩》云「心堪任性說名輕安。違害惛沈，隨順善法。」

"Pliancy (praśrabdhi) means serviceability of mind": pliancy means being able to make the mind serviceable with respect to what is wholesome. Therefore, the Nyāyānusāra states: "The cause of lightness and comfort of body and mind arising from correct attention—serviceability of mind—is called pliancy." Furthermore, the Abhidharmāvatāra states: "Serviceability of mind is called pliancy. It opposes and harms torpor, and accords with wholesome phenomena."