Don't Judge a Book by its Cover (Idiom) 📚

Don't judge a book by its cover.

No juzgues un libro por su portada. ¿

Do you know this idiom? It  means don't judge something  

Conoces este modismo? Significa no juzgar algo

or someone based on their outward appearance.

o a alguien por su apariencia exterior.

He may seem quiet, but don't judge a book by  its cover; he's an excellent public speaker.

Puede parecer tranquilo, pero no juzgues un libro por su portada; es un excelente orador público.

The old building looks kind of  plain and boring on the outside,  

El antiguo edificio parece un poco soso y aburrido por fuera,

but don't judge a book by its cover.  It's absolutely stunning on the inside.

pero no juzgues un libro por su portada. Es absolutamente impresionante por dentro.