أَفَلَمْ يَسِيرُوا فِي الْأَرْضِ فَتَكُونَ لَهُمْ قُلُوبٌ يَعْقِلُونَ بِهَا أَوْ آذَانٌ يَسْمَعُونَ بِهَا فَإِنَّهَا لَا تَعْمَى الْأَبْصَارُ وَلَكِن تَعْمَى الْقُلُوبُ الَّتِي فِي الصُّدُورِ
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سورة الحج
(22/46) Have they not marched forth in the land, so that there might become unto them hearts to understand with or ears re hear with? Verily it is not the sights that are blinded but blinded are the hearts that are in the breasts.
Surah Al-Hajj