Risalah Ma‘rifat Allah: An Exposition of Imam ‘Ali ibn Musa al-Rida’s (‘a) Sermon on the Gnosis of AllahWritten by His Eminence Allamah Hasan Mustafawi, who was himself a man of divine gnosis and mystical knowledge, this treatise is an unprecedentedly profound exposition of Imam Ali ibn Musa al Ridas (a) unique sermon on subtle and esoteric points of the unity (tawhid) and gnosis (marifat) of Allah. Emanating from the station of sublime guardianship (wilayat al kubra), this sermon was delivered by the Imam as a response to the challenge posed by a group