Fundamentalism fuses religion and politics, and in this compelling book Johannes J. G. Jansen describes and analyzes from original Arabic sources the Islamic incarnation of such a fusion. He offers comparisons with millenarian and revivalist movements in other religious traditions to suggest a basic structural similarity in fundamentalism of different creeds. Fundamentalism rejects a core belief of modernity - the separation of religion and politics - and so, according to Jansen, always has an antimodern or reactionary basis. To explore the logic of contemporary fundamentalist ideology, Jansen draws on the work of the two dominant Islamic commentators on religion and politics, Al-Afghani from the nineteenth century and Ibn Taymiyya from the fourteenth. He examines the theological bases of Muslim militancy, and in particular the justification of violent political action, in the more recent writings of Sayyid Qutb.