Rènshí yí ge rén yào shíjiān, cáinéng kànqīng Lúshān zhēnmiànmù.
Getting to know someone takes time before their true nature becomes clear.
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From Su Shi's 《题西林壁》 (Song dynasty): '不识庐山真面目，只缘身在此山中' - you can't see Lushan's true shape because you're standing inside it. A parable about perspective.
