Answer:
There are many reasons why we must never judge a book by its cover. This first one is that you know nothing about someone just by their outward appearance. It should never be the judge of someone’s character.
For instance, if you look at a good-looking person, you can only see their skin colour, physical traits, and maybe fashion. But what about beyond that? You cannot solely make up your mind on their outward appearance.
What if the good-looking person turns out to be horrible in nature? What if they lack any real talent or skill? Thus, you see how outward appearances can be misleading. They are basically valueless things so never judge someone on their face value.