Within the Islamic tradition, "tajdid" (lit., regeneration, renewal) has been an important religious concept. Early on into the Islamic era, Muslims realized that they have not succeeded in creating and maintaining a society that truly followed the principles of their religion. As a result, Islamic history has seen periodic calls for a renewed commitment to the fundamental principles of Islam and reconstruction of society in accordance with the Quran and the traditions of the Islamic prophet Muhammad (hadith). These efforts often drew inspiration from the hadith in which Muhammad states: "God will send to His community at the head of each century those who will renew its faith for it". Throughout Islamic history, Muslims looked to reforming religious leaders to fulfill the role of a "mujaddid" (lit., renewer). Although there is disagreement over which individuals might actually be identified as such, Muslims agree that "mujaddids" have been an important force in the history of Islamic societies.