Muslims believe that the Qur'an represents the words of God as revealed by the Angel Gabriel to Muhammad over a period of approximately twenty-three years, beginning in 610 AD, when he was forty, and concluding in 632 AD, the year of his death. All of it came from the mouth of one man. More people read the Quran than any other book ever written. This new edition of the book has been published to help Muslims not fluent in Arabic to understand the meaning of the words. It includes an English translation by Abdullah Yusuf Ali and a transliteration into Roman text by Abdul Haleem Eliyasee. However, it is important to remember at all times that the authoritative text is the Quran itself. These translations and transliterations are only intended to be helpful guides. They are not substitutes for the original. Every Muslim is required to read and understand the Quran to the extent of his ability. The words "To The Extent of his ability" is key. Obviously, a man who cannot speak Arabic and who is poorly educated will not be able to achieve the same level of understanding that a highly literate and educated native speaker of Arabic can. Nevertheless, even the poorly educated man must try to read and understand the actual words of the Quran. There is no Pope or supreme authority in Islam. Every man is his own authority. This is what Muslims believe.