Source : CEDICT

you can't judge a person by appearance (idiom)/you can't judge a book by its cover/often in combination 人不可貌相,海水不可斗量[ren2 bu4 ke3 mao4 xiang4 , hai3 shui3 bu4 ke3 dou3 liang4]

Source : CEDICT

you can't judge a person by appearance (idiom)/you can't judge a book by its cover/often in combination 人不可貌相,海水不可斗量[ren2 bu4 ke3 mao4 xiang4 , hai3 shui3 bu4 ke3 dou3 liang4]