The Ayatollah Ruhollah Khomeini was the man who sparked the Iranian Revolution, halting the westernization promoted by the last Shah of Iran.

The East, facing the imperialist and colonial pressures of the West, turned to the revival of Islam as a cultural differentiation from the western world, refusing to modernize with political and ideological systems originating from it, as Samuel Huntington writes in his book "The Clash of Civilizations".

Since 1979, Iran has been governed by the Shia clergy, and this small green book explains what Khomeini's phrase means: "Islam is politics or it is nothing."