"The Kashf al-mahjúb: The oldest Persian treatise on Súfiism" by Hujviri is a treatise written in the 11th century. This groundbreaking work presents the first formal and complete system of Sufism, exploring its doctrines, practices, and mystical controversies. Drawing from the author's forty years of travel across the Islamic world and encounters with over three hundred saints, it distinguishes between mere knowledge and true spiritual gnosis, addressing the path to divine wisdom and the quest for spiritual perfection. (This is an automatically generated summary.)