The fourth and the last verse again speaks of the severe reprimand and admonishment of those who demanded to see God. It says, “Those who do not wish to meet us say, “Why have no angels been sent to us, nor have we seen our Lord?” Indeed they think too highly of themselves and great is the insolence of this impiety.”
Actually they wanted on of the two things, the coming of the angels or the vision of God.
The idea behind the coming of the angles was that they should bring to them the revelation sent by God or that they bear witness of the truthfulness of the Messenger.
The answer given by the Qura’n also has two sides. As for the coming of the angel the books says, “they are vain and that is why they make such a demand.”
For the vision of God the books says, “Great is the insolence of their impiety.”
What greater impiety can there be that they consider the necessary and unique being equal to the material and contingent being with bodies and have deemed a time and place for Him.
The language of the verse also proves the impossibility of the vision; the demand would not have been against intelligence had this been possible.