This 3 line verse from the Quran states that those who deny will not believe regardless of whether they are warned or not. It suggests that some people will refuse to believe no matter what evidence or warnings they are presented with. The verse acknowledges that non-believers exist and will remain non-believers.

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As for those who deny, it is all the same if you
warn them or not, they will not believe.
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(Quran Surah 2, Ayah 6)