Meaning of the word "everyone's faults are not written in their forehead" in English

What does "everyone's faults are not written in their forehead" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

everyone's faults are not written in their forehead

US /ˈɛvriˌwʌnz fɔlts ɑr nɑt ˈrɪtən ɪn ðɛr ˈfɔrhɛd/
UK /ˈɛvriwʌnz fɔːlts ɑː nɒt ˈrɪtn ɪn ðeə ˈfɒrɪd/
"everyone's faults are not written in their forehead" picture

Idiom

one cannot judge a person's character or hidden flaws simply by looking at their outward appearance

Example:
He seems like a nice man, but remember that everyone's faults are not written in their forehead.
You shouldn't trust him so easily; everyone's faults are not written in their forehead.