You can't tell a book by its cover
Possible interpretation: You cannot judge what something or someone is like by looking at the exterior.Note: tell (verb) = judge | cover (noun) = thick, protective outer part of a book | Also found in other forms, such as: "Don't judge a book by its cover."
If "you can't tell a book by its cover", you can't judge a person by
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Contributor: Josef Essberger