大般涅槃經義記 3.178

3.178

明不了中，文別有四：一舉昔日不了義經。「如經說」者，如昔小乘經中所說。「一切燒」者，昔說三毒燒諸眾生故名為燒，如下文說；亦可昔說無常之火燒諸世間，故名為燒。宣說諸法斯皆彼燒，故云一切，無常、苦等類亦同爾。「是名」下結，以說一切言無簡別，故名不了。

In explaining the non-definitive, the text has four distinct parts: first, it brings up past sūtras of non-definitive meaning. "As the sūtras preach" means as preached in the former Hīnayāna sūtras. "All is burned" means that formerly it was preached that the three poisons burn sentient beings, hence it is called "burned," as the text states below; or it may mean that formerly it was preached that the fire of impermanence burns all worlds, hence it is called "burned." Preaching that all dharmas are thus burned by it is why it says "all"; impermanence, suffering, and the like are also of this category. From "This is named..." onwards is the conclusion: because it speaks of "all" without differentiation, it is therefore named non-definitive.