 Because their aim is clearly salvation, it has often been supposed that the Rasâ’il were inspired by the Shî‘ites, or perhaps even the Ismâ‘îlis, both of whom claim the ideological commitment of the encyclopedia. For Marquet (1975, 585) the encyclopedia is the most ancient general exposition of the Ismâ‘îli doctrine. In 1150, the Sunni orthodoxy in the person of the caliph al-Mustanjid judged the work heretical and sent the existing versions to be burnt. Yet in spite of this, the encyclopedia survived and was translated into Persian and Turkish (Corbin, 1964, 193–194). A harsh judgment on the Ikhwân was delivered by the famous Mamlûk muftî and theologian Taqî al-Dîn Ahmad ibn Taymiyya (d. 1328). He considered them as Shî‘i esotericists whose doctrines contradict the religion of Islam. For this reason, he rejected the attribution of the Rasâ’il to such an eminent religious scholar as Ja‘far al-Sâdiq (Michot 2008).