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Three things are necessary for the salvation of man: to know what he ought to believe; to know what he ought to desire; and to know what he ought to do.
设计中最难的部分是保持功能的简洁。
楚国的狂人接舆唱歌路过孔子车旁,说:“凤啊!凤啊!你怎么这样倒霉?过去的不可挽回,未来的还可以赶上。算了!算了!现在的执政者很危险!”