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Short form of 仁者见仁,智者见智, derived from the 《易经·系辞上》: 'The benevolent see it and call it benevolence; the wise see it and call it wisdom.' Often used on its own to acknowledge that reasonable people disagree.
usage
Usually paired with 智者见智 (zhì zhě jiàn zhì) as the full expression, but widely used alone in modern writing.