You can only tell if something is good by trying it.
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You can only judge something by trying it, not by how it looks.
The proof is in the pudding means results matter more than promises.
It is used to say that what happens counts more than what was claimed.
"Actions Speak Louder than Words"
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What people do is more telling and trustworthy than what they claim or promise
"Don't Judge a Book by Its Cover"
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You cannot know something's true quality or character from its external appearance alone
"The Proof is in the Pudding"
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The real test of quality or value comes from actual results, not appearances