“They say that Caliph Omar, when consulted about what had to be done with the library of Alexandria, answered as follows: 'If the books of this library contain matters opposed to the Koran, they are bad and must be burned. If they contain only the doctrine of the Koran, burn them anyway, for they are superfluous.' Our learned men have cited this reasoning as the height of absurdity. However, suppose Gregory the Great was there instead of Omar and the Gospel instead of the Koran. The library would still have been burned, and that might well have been the finest moment in the life of this illustrious pontiff.”
Jean-Jacques Rousseau, Discourse on the Sciences and Arts (1st Discourse) and Polemics“Just as the Torah and Bible teach concern for those in distress, the Koran instructs all Muslims to make caring for widows, orphans, and refugees a priority.”
Greg Mortenson, Three Cups of Tea: One Man's Mission to Promote Peace ... One School at a Time“From the literary point of view, the Koran has little merit. Declamation, repetition, puerility, a lack of logic and coherence strike the unprepared reader at every turn. It is humiliating to the human intellect to think that this mediocre literature has been the subject of innumerable commentaries, and that millions of men are still wasting time in absorbing it." (Orpheus, Salmon Reinach, 1932. See page 175 of the book here)”
Salomon Reinach, Orpheus: A History of Religions