大般涅槃經義記 3.171

3.171

下次明其大乘可依，句別有四：初「大乘法則應依」者正明可依；二「何以」下明大了義，成前應依，先徵、後解，明「佛為度諸眾生故，以方便力善說大乘」，窮深決了，是故應依；三「是故應依」結前第一；四「是名了義」結前第二。「如是四」下總以結之。

Next, it explains that the Mahāyāna can be relied upon, with four distinct lines: first, "The teachings of the Mahāyāna should be relied upon" directly explains that it can be relied upon; second, from "Why?" onwards explains that the Great [Vehicle] is of definitive meaning, establishing the aforementioned [statement] that it should be relied upon, first querying and then explaining, clarifying that "Because the Buddha wishes to save all sentient beings, he skillfully preaches the Mahāyāna by the power of expedient means," exhausting what is profound and decisive, and therefore it should be relied upon; third, "Therefore it should be relied upon" concludes the first [point] above; fourth, "This is called definitive meaning" concludes the second [point] above. From "These four..." onwards is the overall conclusion.