《孟子·公孙丑上》第二章即“养气章” ,是《孟子》中很难理解的一章 ,其疑难集中在“不得于言 ,勿求于心 ;不得于心 ,勿求于气。”①一句的理解上 ,古往今来学术界争论不断。本文试图从“言”字的解释入手 ,以“义”为核心 ,对“不得于言 ,勿求于心 ;不得于心 ,勿求于气”进 Chapter 2 of Mencius, Gongsun Chouxu, chapter 2 of “Yang Qi” is a chapter that is difficult to understand in Mencius. The difficulty lies in “no words, ”① In the comprehension of a sentence, there has been a constant argument in academia from the past to the present. This article tries to begin with the explanation of the word “yi”, with “righteousness” as the core, to "can not say or do not ask for heart;