This 1935 English translation of a classic Arabic text in Sūfīsm, the mystical aspect of Islam, by A. J. Arberry preserves the beauty and simplicity of the original without departing from a literal translation. Little is known of the author of this treatise Abū Bakr al-Kalābādhī, except that he was a lawyer and died in Bukhārā in about AD 990. This book is the work on which his fame rests, and is important because...