This is the first ever translation into English of a seminal work from the Sufi tradition. This title focuses on the Divine Name Allah and the virtues and transformative power of its invocation. Written by the renowned Sufi master Ibn Ata Allah al-Iskandari in the twelfth century the work is divided into two parts. Part One looks at the Name of Allah, its letters and their meanings. While in Part Two the author turns to the more practical question of the role of invocation, both in general and of the Name Allah specifically. Ibn Ata Allah discusses the virtue of invocation and establishes that it is the supreme act of worship. The reader comes to understand that, by emulating the Qualities of God as expressed in His Names and invoking His Supreme Name Allah with awareness of its meaning and significance, the Sufi can cleanse his heart and until it becomes a worthy abode for God.