大般涅槃經義記 7.47

7.47

自下第四如來釋通，「善哉」嘆問，下正辯釋，文別有四：一牒前六難明不可說遣人定執、二「有因緣」下明前可說令人求解、三從「云何不生生」下釋前第一不可說義、四「云何有因亦可說」下釋前第二可說之義。

From here on is the fourth [part], the Tathāgata explaining and resolving [the objections]. "Excellent!" praises the question. Below he directly analyzes and explains, the text having four distinct parts: First, he takes up the previous six objections and explains that they are ineffable, eliminating people's fixed attachments. Second, from "There are causes and conditions..." downward, he explains that the aforementioned can be spoken of, prompting people to seek understanding. Third, from "What is it that 'arising when not [yet] arisen'..." downward, he explains the former first meaning of ineffability. Fourth, from "How is it that with causes it can also be spoken of..." downward, he explains the former second meaning of being speakable.