"(We sent) messengers as givers of glad tidings and as warners...

"(We sent) messengers as givers of glad tidings and as warners, so that people might have no argument against Allah after the (invitations of) the messengers, and Allah is the Mighty, the Wise." This verse expresses the words of prophets' invitation and the method of their effort, together with the purpose of the mission of prophets to prophet hood. The method of the work of prophets is based on two pivots: 'glad tidings' and 'warning'.

"(We sent) messengers as givers of glad tidings and as warners, so that people might have no argument against Allah after the (invitations of) the messengers, and Allah is the Mighty, the Wise." The philosophy of the mission of prophets is *Allah's '*completing the argument' for humankind so that they cannot say that they had not any leader or guide.

It is necessary to mention that from the point of personal epithets, background of life, social, political, genealogical, and physical situation, and also from the point of having miracles, clear statements, and being aided by hidden helps, prophets should be in a state that no one be able to object any things of theirs.

"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. "But Allah bears witness to what He has sent down to you ..." 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.