Avoid making conclusions based only on what's visible; there's often more beneath the surface.
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To not form an opinion about someone or something based only on how they look.
When you say don't judge a book by its cover, you mean that appearances can be misleading and that you need to look deeper.
It's used when someone dismisses or praises something too quickly based on surface impressions.
"First Impressions Matter"
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The idea that how you appear initially has a lasting impact
"Look Before You Leap"
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Think carefully before acting, especially in risky situations
"Don't Judge a Book by Its Cover"
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Appearances can be misleading — look deeper before forming an opinion