rén​bù​kě​mào​xiàng, hǎi​shuǐ​bù​kě​dǒu​liáng

don't judge appearances

Senses

人不可貌相,海水不可斗量 rén​bù​kě​mào​xiàng, hǎi​shuǐ​bù​kě​dǒu​liáng don't judge appearances

you can't judge a person by appearance, just as you can't measure the sea with a pint pot

他虽然穿得普通,但人不可貌相,海水不可斗量,他其实身价过亿。

References

see 海水不可斗量/海水不可斗量 人不可貌相,海水不可斗量/人不可貌相,海水不可斗量