大般涅槃經義記 5.152

5.152

In the extensive discussion below, there are two questions and answers: the first question and answer explains that the substance of the truths is one because they are not separate from each other; the second question and answer explains that the marks of the truths are distinct because of their difference in shallowness and depth. In the first question, he first reiterates the two truths and asks generally what they are; next, in relation to the two truths, he asks whether marks exist or not. Below, in setting up objections: 'If they exist, then they are one truth' is a query and objection based on existence; 'If they do not exist, might they not be false?' is a refutation and censure based on nonexistence. Below, the Buddha answers it: 'the conventional is identical to the ultimate'; because they are mutually identical, mutual existence is also obtained.