Avoid making conclusions based only on what's visible; there's often more beneath the surface.
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To not judge someone or something by how they look.
When you say don't judge a book by its cover, you mean looks can fool you.
It's used when someone praises or writes something off too fast.
"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