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

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
(idiom) you cannot judge a person by appearance, just as you cannot measure the sea with a small container; one should not underestimate others based on their looks or status

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