大般涅槃經集解 20.16

20.16

案僧亮曰：不定謂不偏也。涅槃實故，名妙有也；生死虛故，名為無也。因果相續，一體之中而有二相不定者，此明法理不偏也。寶亮曰：為失者作譬也。將作譬故，先舉失者所計斷常。計斷是無、計常是有，既是橫計，所以不定也。下引四大其性各異為類，如計常也。

Sengliang comments: 'Indefinite' means not one-sided. Because nirvāṇa is real, it is called subtle existence; because saṃsāra is unreal, it is called non-existence. Cause and fruit are continuous; having two characteristics within a single entity that are indefinite clarifies that the principle of phenomena is not one-sided. Baoliang comments: Providing a simile for those who incur loss. Being about to make a simile, he first cites the annihilation and permanence conceived by those who incur loss. Conceiving annihilation is non-existence, and conceiving permanence is existence; since these are arbitrary reckonings, they are indefinite. Below, he cites the different natures of the four great elements as an analogy, like conceiving permanence.