大般涅槃經義記 6.260

6.260

上來汎舉安、不安人，自下正明己之不安，於中有四：一明己病重，先舉後辨；二「一切良」下彰己難治，先辨後釋；三「如魚」下舉喻類己，顯己不安，六喻顯之；四「我曾聞」下引說驗己，成己不安。

Above, [the text] broadly cited those who are at peace and not at peace; from here below, it directly explains one's own lack of peace, wherein there are four [parts]: first, it explains that one's own illness is grave, first bringing it up and then distinguishing it; second, from "all fine [physicians]" onward, it demonstrates that one is hard to cure, first distinguishing and then explaining; third, from "like a fish" onward, it brings up analogies to liken to oneself to reveal one's lack of peace, revealing it through six analogies; fourth, from "I once heard" onward, it cites teachings to verify oneself, establishing one's own lack of peace.