The epistles contain philosophical discourses about Neoplatonic and Gnostic subjects, Ptolemaic cosmology, Arabic paraphrases of the philosophies of Farabi, Plotinus and Proclus, writings on the Universal Soul along with several polemic epistles concerning other faiths and philosophies that were present during that time and towards individuals who were considered renegades or those who tried to distort and tarnish the reputation of the faith and its teachings such as the "Answering the Nusayri" epistle and the fifth volume of the Epistles. Most of the Epistles are written in a post-classical language, often showing similarities to Arab Christian authors.[4][12] The texts provide formidable insight into the incorporation of the Universal Intellect and Soul of the world in 11th century Egypt, when the deity showed itself to men through Fatimid Caliph al-Hakim and his doctrines. These display a notable form of Arabic Neoplatonism blended with Ismailism and adopted Christian elements of great interest for the philosophy and history of religions.[2] It is believed by the Druze from interpretation of the epistles that Al-Hakim did not die, but merely withdrew into occultation and will return one day and reveal the Druze wisdom to the world in order to inaugurate a golden age.[13]