This book is about Iranian Islamism on grass-roots level. It provides a vivid, near-life portrait of young activist men who uphold this movement through their zealous support of revolutionary ideals and the present regime. It is based on interviews with a group of volunteers in the Iranian home guard movement known as basij during a period of four years. By focusing on beliefs and rituals of individual persons, it gives a unique picture of the shifting motifs behind Islamist engagement in today's Iran. The book contextualises the interviewed individuals within the wider framework of Iranian society and relates their stories to a discussion on ritual, emotion, embodiment and authority. It is of interest to anyone who seeks to understand the multifaceted driving forces behind Shi'ite Islamism today.