明鏡高懸

míngjìnggāoxuán

According to Miscellaneous Records of the Western Capital, Qin Shihuang, the first emperor of the Qin Dynasty, had a mirror which could show the good or evil of a person. This gave rise to the phrase "clear mirror hung on high" to mean impartiality and strictness of a judge in trying cases.

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ming2 jing4 gao1 xuan2

a bright mirror hung high (idiom); fig. a mirror into the conscience of officials, Big brother is watching you.

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明鏡高懸|明镜高悬 [míng jìng gāo xuán] ► perspicacious and impartial in judgment (idiom)