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The greatest battles are not fought with weapons, but with ideas.
"The only thing that is truly eternal is the human heart."
You can't run a business, or anything, on a theory.
You don't need a weatherman to know which way the wind blows.
【释义】君子的行为,行动时要思考是否符合道义,不为利益所诱惑,不为道义而感到愧疚。