Written in a clear, lucid style, it offers a glimpse into the Sufi world of the 7th Islamic century and allows us to see almost at first hand how the novice was guided by the Sufi Shaykh and, above all, the purpose and preparation involved in engaging in the invocation, dhikhru'llah. Ibn Ata' Allah sets out to define it, to explain its nature and power, to show its results and to prove that it is part of the Prophet's Sunna, or practice. The author goes to great lengths to point out many Qur'anic verses where dhikru'llah is mentioned and cites many noted authorities.