أَوَ عَجِبْتُمْ

("Do you wonder..."), do not wonder because of this. Surely, it is not strange that Allah sends down revelation to a man among you as mercy, kindness and compassion for you, so that he warns you that you may avoid Allah's torment by associating none with Him,

وَلَعَلَّكُمْ تُرْحَمُونَ

Here, the answer given was: أَوَعَجِبْتُمْ أَن جَاءَكُمْ ذِكْرٌ‌ مِّن رَّ‌بِّكُمْ عَلَىٰ رَ‌جُلٍ مِّنكُمْ لِيُنذِرَ‌كُمْ وَلِتَتَّقُوا وَلَعَلَّكُمْ تُرْ‌حَمُونَ ﴿63﴾ (Do you wonder that an advice from your Lord has come to you through a man from among you, so that he may warn you and that you may fear Allah, and that you may be blessed with mercy?) [ that is, his warning may lead you to stop opposing him as a result of which you may be blessed with mercy ]

The substance of the argument is that the making of a human being a messenger of Allah is not a matter of surprise. First of all, Allah Ta` ala is the Absolute Master. Bestowing on someone the status of a prophet or messenger is His exclusive domain. It is He who does it at His will. No one is in a position to dare have it otherwise. In addition to that, a little deliberation will make it clear that the purpose of sending a prophet or messenger to guide human beings can only be achieved through a human being. This is a mission angels cannot perform.