In the mid-1970s, Ayatullah Sayyid Ali Khamenei delivered a series of lectures fusing the spiritual and political, implicitly questioning the authority of the Shah at a politically tense time. He emphasised that belief in one God as the ruler and owner of the universe leaves no room for worshipping other gods, spiritual or temporal. These lectures breathed new life into the Quranic themes of faith, monotheism (tawhid), prophethood, and guardianship (wilayah); a true Muslim should side with the godly powers in the eternal battle between divine powers and satanic forces. This book is a distillation of those lectures.