Since its completion in the seventeenth century, this book has been lauded as a valuable textbook on Islamic spirituality and ethics as well as a spiritually enlightening read. This ground breaking translation brings to light how Mulla Muhsin Fayd Kashani engages with the Sunni Sufi tradition – particularly the ideas of al-Ghazzali – for the benefit of a Shi‘a audience. In addition to presenting the inner mysteries of Islamic ritual practices, Fayd Kashani also explains the nature of the human character and how to cultivate, balance, and eliminate various traits. The work answers many commonly asked questions by Muslims such as what is the deeper meaning of fasting and how to concentrate in prayer.