"Nothing from the contents of Ibn Ishaq is confirmed by inscriptions or other archeological material. Testimonies from non-Muslim contemporaries do not exist. Greek, Armenian, Syriac and other sources about the beginnings of Islam are very difficult to date, but none of them is convincingly contemporary with the Prophet of Islam. Under such circumstances, no biography can be a scholarly work in the modern sense of that word, not even with the help of an omniscient Ibn Ishaq."