The Islamic Revolution of 1979 in Iran should be understood as a process of building political consensus under leadership of religious activism. The conflicts that marked the Iranian society during the second half of the twentieth century have been gathered in a project of nation developed mostly by Ayatollah Khomeini during his exile in France. His speeches at that time were accompanied by political language grounded in experiences of militant faith recognized by most of the Iranians as manifestations of a legitimate power project. After the victory of 1979`s revolution and implantation of the Islamic Republic in Iran, elements of this political lexicon are incorporated into the new National Constitution, maintaining the dominance of the religious and granting small spaces for political discussion to sectors that have supported the revolution, such as liberals and socialists. The project of nation applied to the Constitutional Letter suits the new political portrait in the country, influenced by internal affairs such as the consolidation of the wilayat al-faqih theory; and by external demands such as the Iran-Iraq War started in 1980.