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lākini llāhu yashhadu bi-mā ʾanzala ʾilayka ʾanzalahū bi-ʿilmihī wa-l-malāʾikatu yashhadūna wa-kafā bi-llāhi shahīdan
But Allah bears witness to what He has sent down to you—He sent it down with His knowledge—and the angels bear witness [too], and Allah quite suffices as witness.
— Ali Quli Qarai
Surah An-Nisa', Verse 166
166. "But Allah bears witness to what He has sent down to you that He has sent it down with His knowledge, and the angels (also) bear witness; and Allah is Sufficient as witness."
This very fact that the high standard of knowledge of the Qur'an has been delivered by an illiterate person in an environment full of ignorance and enmity, and that it changed the state of people from dispersion to unity, from avarice to donation, from paganism to theism, from ignorance to knowledge, and from descent to spiritual ascent so that they reached to the condition of formation of 'the Islamic Ummah', is an evidence for Allah's grace (s.w.t.) toward the holy Prophet (S) and for His favour to his religion.
That is why the best shelter and the source of hope in all prophets has been the support and aid of Allah.
By the way, the origin of revelation is the infinite knowledge of Allah. So, with the advance of science, every day some parts of the Qur'anic wisdom will be manifested.
It should be regarded that if there are some obstinate sinful persons in some corners of the world who seek pretexts, in spite of that, there are all the pure knowledgeable angels in the world of existence who bear witness alongside the Holiness of Allah. It says: