There must be millions of book in the world, each having its own specialty. However, there cannot be any book in the world as the “Holy Quran,” a Scripture containing the pure words of Allah Almighty, just as pure as they were more than 1400 years ago when Qur’an was revealed upon last of the Prophets, Muhammad (PBUH).

Allah Almighty says in Quran:
Qaf [50:29] The Sentence that comes from Me cannot be changed, and I am not unjust to the slaves.”
This is just one example where Allah Almighty tells people that Qur’an is purely His words, clarifying the doubt people used to raise, claiming Muhammad (PBUH) as the author of Quran. Allah (SWT) further says:
Do they not then consider the Qur’aan carefully? Had it been from other than Allah they would surely have found therein much contradictions }[Qur’aan 4:82]
Not only is Qur’an comprised of words of wisdom from Almighty Allah, but it also serves as the source of guidance which can be compared to none other, as we get to know when we learn Quran online:
Yunus [10:57]. O mankind! There has come to you a good advice from your Lord (i.e. the Qur’an, enjoining all that is good and forbidding all that is evil), and a healing for that (disease of ignorance, doubt, hypocrisy and differences,) Which is in your breasts, – a guidance and a mercy (explaining lawful and unlawful things) for the believers.
The biggest proof of positive impact of words of The Mightiest is the transformation of Arab society from almost barbarians to one of the most cultured and civilized ones in a matter of few decades, courtesy to the teachings of Prophet Muhammad (PBUH) and Qur’an.