阅读下面的《论语》《孟子》选段,回答问题。
①子曰:“已矣乎!吾未见能见其过而内自讼者也。”(《论语·公冶长》)
②子曰:“见贤思齐焉,见不贤而内自省也。”(《论语·里仁》)
③孟子曰:“爱人不亲,反其仁;治人不治,反其智;礼人不答,反其敬。行有不得者,皆反求诸己,其身正而天下归之。”(《孟子·离娄上》)
请简要概括孔子对“自省”的看法。(3分)
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如何理解孟子的“反求诸己”?请结合文段简要分析。(3分)
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