大方廣圓覺修多羅了義經略疏 2.77

2.77

知其愛惡、愛善俱未免苦，棄彼愛心，樂修捨法。捨法即四禪八定，而不知樂捨之心還同彼愛，故云還滋愛本。

Knowing that craving evil and craving good both fail to escape suffering, they discard that craving mind and delight in cultivating the dharmas of equanimity. The dharmas of equanimity are the four dhyānas and eight samāpattis; yet they do not know that the mind delighting in equanimity is still identical to that craving, and therefore it is said that it 'yet nurtures the root of craving.'