大般涅槃經義記 4.43

4.43

下佛答之，先列三門明皆不可。不定有無，正答前難；不從他生，遍防異計。言「不定有」成初段中不自生義，「不定無」者成初段中從乳生義，「不從他」者成初段中非他生義。

Below, the Buddha answers it, first laying out three approaches to explain that all are inadmissible. That existence and non-existence are not fixed directly answers the previous objections; that it does not originate from another comprehensively guards against divergent doctrines. The phrase 'not fixedly existent' establishes the meaning of not originating from self in the first section; 'not fixedly non-existent' establishes the meaning of originating from milk in the first section; 'not from another' establishes the meaning of not originating from another in the first section.