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Do you judge a book by its cover?

a month ago
A common idiom in English.

Don't judge a book by its cover.

The meaning is applicable to a book with a nice picture on the front but the contents do not match up to the impression on the outside. The idiom is used in relation to judging a person by looks or appearance only.

Better to judge a book by its bibliography, contents page, publisher, date of publication, topic, title, author, introduction, and finally the actual substance of the content.