Some modern scholars have argued for an Ismaili origin to the writings. Ian Richard Netton writes in "Muslim Neoplatonists" (London, 1982, p. 80) that: "The Ikhwan's concepts of exegesis of both Quran and Islamic tradition were tinged with the esoterism of the Ismailis." Whilst according to Yves Marquet, "It seems indisputable that the Epistles represent the state of Ismaili doctrine at the time of their compositions" (vide, "Encyclopaedia of Islam", 1960, p. 1071) Bernard Lewis in "The Origins of Ismailism" (London, 1940, p. 44) was more cautious than Fyzee, ranking the Epistles among books which, though "closely related to Ismailism" may not actually have been Ismaili, despite their batini inspiration. Ibn Qifti (d.646/1248), reporting in the 7th/13th century in "Tarikh-i Hukama" (p. 82) that, "Opinions differed about the authors of the Epistles. Some people attributed to an Alid Imam, proffering various names, whereas other put forward as author some early Mutazilite theologians."