A History of the Intellectual Development of Europe, Kap. XI
Original engl.: "The Koran abounds in excellent moral suggestions and precepts; Its composition is so fragmentary that we cannot turn to page without finding maxims of which all men must approve. This fragmentary construction yields texts, and mottoes, and rules complete in themselves, suitable for common men in any of the incidents of life."
John William Draper Zitate und Sprüche
Über Mohammed, A History of the Intellectual Development of Europe, Kap. XII
Original engl.: "Four years after the death of Justinian, AD 569, was born in Mecca, in Arabia, the man who, of all men, has exercised the greatest influence upon the human race."