“…As exceptional works, I shall mention Van Ess, 1968(repr. 2018; Heck, 2006Heck, , 2014Shihadeh, 2007;Kukkonen, 2010;and Fatoorchi, 2013. mystical grounds, an invalid or at least an inadequate source of knowledge. 2 This study will deal with the sceptical arguments by one of the most important figures of the philosophical Sufi tradition (the Akbarian school) and the stepson and foremost disciple of Ibn ʿArabī (d. 1240), Ṣadr al-Dīn al-Q unawī (d. 1274), 3 arguments meant to prove that reason and rational procedures are unable to achieve certain knowledge of metaphysical subjects, that is, God and the ultimate causes of things.…”