This academic work by Prof. Dr. Muhammad Hadi al-Tikriti presents a rigorous and systematic investigation into the field of Sufism. The book moves beyond mere historical accounts to offer a methodological framework for understanding its core tenets, practices, and evolution. It critically examines the foundational principles and influential figures that have shaped this profound spiritual path, making it an indispensable resource for researchers, students, and anyone seeking a structured and scholarly approach to the study of Islamic mysticism.