This is an introduction to the Islamic sciences: Philosophy, al-kalam (Muslim scholastic philosophy), ‘irfan (Islamic mysticism), usul al-fiqh (principles of jurisprudence), fiqh (Islamic jurisprudence) and hikmat al-‘amali (practical philosophy or practical morality). This collection of Murtaza Mutahhari’s papers on the Islamic sciences serves as a comprehensive survey of the fundamentals of different branches of the Islamic sciences, and is also a general guide to understanding the basic teachings of Islam.