大般涅槃經義記 9.197

9.197

下二問答明疑及著斷善根中，初一問答出疑著人。「是誰」問也，「斷善」答也。後一問答正明斷善。「世尊！何人能斷善根」乘前請問。下佛答之。初先略答，「離是四」下隨別廣答。「若有深見無因果」下，總以結之。略中總明，「黠慧利根善能分別」簡利異鈍；「遠離友」等，簡惡異善。良以不能近友聞法正思修行，故斷善根。「如是能斷」總以結之。

Below, within the two question-and-answer exchanges explaining how doubt and attachment sever the roots of good, the first question and answer brings forth the person of doubt and attachment. "Who is it?" is the question; "The one who severs the [roots of] good" is the answer. The latter question and answer directly clarifies the severing of the roots of good. "World-Honoured One! What sort of person is able to sever the roots of good?" asks the question based on what came before. Below, the Buddha answers. First, a brief answer; from "Apart from these four" onward, there is an extensive answer following specific details. From "If one has deep views of neither cause nor fruit" onward, it concludes as a whole. In the brief [answer], it clarifies overall that "clever, intelligent, of sharp faculties, and skillfully able to distinguish" distinguishes the sharp from the dull; "keeping distant from friends," and so on, distinguishes the bad from the good. It is precisely because one cannot draw near to friends, hear the Dharma, and cultivate correct reflection that one severs the roots of good. "Such a one is able to sever" concludes as a whole.