﴿ أَفَلَمْ يَسِيرُوا۟ فِى ٱلْأَرْضِ فَتَكُونَ لَهُمْ قُلُوبٌۭ يَعْقِلُونَ بِهَآ أَوْ ءَاذَانٌۭ يَسْمَعُونَ بِهَا ۖ فَإِنَّهَا لَا تَعْمَى ٱلْأَبْصَٰرُ وَلَٰكِن تَعْمَى ٱلْقُلُوبُ ٱلَّتِى فِى ٱلصُّدُورِ ﴾

“Have they, then, never journeyed about the earth, letting their hearts gain wisdom, and causing their ears to hear? Yet, verily, it is not their eyes that have become blind - but blind have become the hearts that are in their breasts!”

(Have they not travelled in the land) have the people of Mecca not travelled for their trade, (and have they hearts wherewith to feel) fear and that which was done to others upon beholding and reflecting (and ears wherewith to hear) the Truth and threats? (For indeed it) seeing without reflection; it is also said that " it " here refers to the expression of idolatry (is not the eyes that grow blind) such that it ceases to see physical objects, (but it is the hearts which are within the bosoms, that grow blind) from the Truth and guidance.