According to scholar Vali Nasr, political tendencies of Sunni and Shia Islamic ideology differ, with Sunni Islamic revivalism "in Pakistan and much of the Arab world" being "far from politically revolutionary", while Shia political Islam is strongly influenced by Ruhollah Khomeini and his talk of the oppression of the poor and class war. Sunni revivalism "is rooted in conservative religious impulses and the bazaars, mixing mercantile interests with religious values." ... Khomeini's version of Islamism engaged the poor and spoke of class war.