The Quran is a book of unsurpassable greatness. The proof of its being so is that untruth cannot enter it either from the front or from behind, i.e., there is no possibility of interference with it from any side. It cannot be distorted either directly or indirectly. And this holds true now and for all time to come. This is a very extraordinary forecast to make. In terms of the cause-and-effect system of this world, if this forecast has to come true, it is necessary that a strong community should permanently exist as the bearer of the Quran; it should not be at variance with the teachings of previous prophets; nobody should ever be able to find fault with the Quran; the evolution of knowledge should never result in contradiction of any of its statements; the vicissitudes of history should not exert any influence upon it; the language of the Quran, Arabic, should always remain a living language. Islam’s long history after the revelation of the Quran shows that, surprisingly, all these factors in its favour have strongly resisted erosion. The very convergence of these factors is quite extraordinary: there is no other book except the Quran in respect of which so many positive factors have continuously remained accumulated for so long a period as one thousand five hundred years. This is sufficient proof that the Quran is the Book of God. The greatness of the Quran must be discovered through argument and reasoning and not by a display of power. Its greatness will be apparent on the basis of power on the Day of Judgement. But then those who did not accept God’s Truth on the strength of arguments would be compelled to accept this Truth by being humbled.