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 traveled in the earth so that they should have hearts with which to comprehend, or ears with which to hear? Surely it is not the physical eyes that are blind, but blind are the hearts which are in the bosoms.
Surah Al-Hajj