أَفَلَم يَسيروا فِي الأَرضِ فَتَكونَ لَهُم قُلوبٌ يَعقِلونَ بِها أَو آذانٌ يَسمَعونَ بِها ۖ فَإِنَّها لا تَعمَى الأَبصارُ وَلـٰكِن تَعمَى القُلوبُ الَّتي فِي الصُّدورِ

So have they not traveled through the earth and have hearts by which to reason and ears by which to hear? For indeed, it is not eyes that are blinded, but blinded are the hearts which are within the breasts.