One of Amir-Moezzi's fundamental arguments is that the supra-natural and supra-rational beliefs about the Twelve Imams were the core of Twelver Shiʿism. This puts him in conflict with the prevailing interpretation that it was the rational tradition, lead by figures such as al-Shaykh al-Mufid, that constituted this core.[2] This argument was initially put forward in Le guide divin dans le Shiisme original (The Divine Guide in Early Shi‘ism), and continued to be developed in his later work.