This article introduces the work of Sayyid ibn Tawus called Muhasaba al-Nafs, offering a biography of the author, an overview of the book, and a summary of each chapter, which includes topics such as the recording of our deeds and its exposure to God, the Prophet, and the Infallibles; the importance of self-accounting, practical steps to self-purification, and the special days, times, and places for prayer and to fulfill one’s duties.