人不可貌相，海水不可斗量
rén​bù​kě​mào​xiàng​hǎi​shuǐ​bù​kě​dǒu​liáng

you can't judge a book by its cover

  1. 人不可貌相 rén​bù​kě​mào​xiàng
    never judge a book by its cover
    One cannot judge a person by their appearance; often followed by the phrase 海水不可斗量 hǎi​shuǐ​bù​kě​dǒu​liáng
  2. ， hǎi
    non-Chinese
  3. 海水不可斗量 hǎi​shuǐ​bù​kě​dǒu​liáng
    don't judge a person by appearance
    you cannot judge a person by their appearance, just as the sea cannot be measured with a small bucket; do not underestimate others