Have they feet with which they walk, or have they hands with which they hold, or have they eyes with which they see, or have they ears with which they hear? Say: Call your associates, then make a struggle (to prevail) against me and give me no respite.

And who is more unjust than he who is reminded of the communications of his Lord, then he turns away from them and forgets what his two hands have sent before? Surely We have placed veils over their hearts lest they should understand it and a heaviness in their ears; and if you call them to the guidance, they will not ever follow the right course in that case.