金光明最勝王經疏 4.524

4.524

贊曰：合不了無。由其無智，不了第一義、不證如故，不知諸法性不可說。如言執實，不知實無。

The commentary says: This applies the failure to discern non-existence. Because of their lack of wisdom, they do not discern the ultimate truth and do not realize tathatā; hence they do not know that the nature of all phenomena is ineffable. Clinging to reality according to words, they do not know that it is substantially non-existent.