Al-Hajj 22:46

Afalam yaseeroo fee al-ardi fatakoonalahum quloobun yaAAqiloona biha aw athanunyasmaAAoona biha fa-innaha la taAAmaal-absaru walakin taAAma alquloobu allateefee assudoor

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.

Have they not, then, traveled on earth so that they should have had hearts to understand with, or ears to listen with? The fact is that it is not the eyes that turn blind, but what turns blind is the hearts contained in the chests.