瑜伽論記 6.532

6.532

下明緣境不同，準彼智論，四無量心竝名慈愍觀。此論欲存此義，故辨慈悲喜緣境不同，以捨通故不論其境。

Below, it clarifies the difference in focal objects: according to the Mahāprajñāpāramitopadeśa, the four immeasurables are all named the contemplation of benevolence. This treatise wishes to preserve this meaning, hence it differentiates the differences in the focal objects of benevolence, compassion, and sympathetic joy; because equanimity is universal, its object is not discussed.