大般涅槃經集解 60.22

60.22

案僧亮曰：第三，捨用。捨無別法為體也。執急則斷者，草緩則失，急則斷也。專空著斷，譬定多也。捨空著有，譬慧少也。於空不空、於有不有，定慧等捨之用也。寶亮曰：此下正辨定慧相資合用之意。

Sengliang states: The third is the application of equanimity (upekṣā). Equanimity has no separate dharma as its substance. 'Grasping too tightly will snap it': with grass, if one is slack it slips away, and if tight it snaps. Exclusively focusing on emptiness and clinging to severance is an analogy for an excess of concentration. Abandoning emptiness and clinging to existence is an analogy for a deficiency of wisdom. Being neither empty regarding emptiness nor existent regarding existence is the application of the equanimity in which concentration and wisdom are equal. Baoliang states: From here downward, the text properly explains the intention behind the mutual support and combined application of concentration and wisdom.