唐太宗李世民: "以铜为镜，可以正衣冠，以史为镜，可以知兴替，以人为镜，可以明得失" - Tang Taizong Li Shimin: Using copper as a mirror, one can arrange one's clothes; Using history as a mirror, one can know the ups and downs of history; Using others as one's own mirror, one can know one's gains and losses every day
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