不识庐山真面目
bù​shí​lú​shān​zhēn​miàn​mù

can't see the forest for the trees

  1. 不识 不識 bù​shí
    to not recognize
    To be unable to distinguish or identify; to not know someone or something.
  2. 庐山 廬山 lú​shān
    Mount Lushan
    A famous mountain in Jiujiang, Jiangxi Province, known for its scenery, cultural history, and as a summer resort; a UNESCO World Heritage site
  3. 真面目 zhēn​miàn​mù noun
    true colors
    one's true appearance or original identity; often used in a negative sense meaning to reveal someone's hidden nature