Kashf al-Mahjub (Revelation of the Hidden) is one of the most ancient and revered Persian treatise on Sufism which contains a complete system of Sufism with its doctrines and practices. Hujwiri clarifies and illustrates many of his mystical controversies and current opinions with his experiences. The book, with its Persian flavor of philosophical speculation and fiction, is itself a piece of Ali Hujwiri's identity.