This book is an introduction to the classical Islamic sciences of philosophy, kalam (theology), ‘Irfan (mysticism), usul al-fiqh (the principles of jurisprudence), fiqh (jurisprudence), and hikmat al-‘amali (practical philosophy and morality). Compiled from the works of one the most prolific and influential Islamic thinkers of the twentieth century, Murtada Mutahhari, it surveys the fundamentals of these branches of the Islamic sciences from the perspective of multiple Islamic sects and ideologies. An excellent guide to the foundational teachings of Islam as well as an effective introduction to further studies in the classical Islamic sciences.