A Critical Assessment of Epistemological and Mutual-Reverse Arguments for Intellectual Moral Good and Bad

The imami-shi'i philosopher and theologian, Nasir al-Din al-Tusi in his great and influential work, Tajrid al-iʿtiqad, had advanced three arguments for what is commonly called "intellectual moral good and bad" (husn wa qubh 'aqli). Two of these three arguments are what we call respectively: "epistemological argument" and "mutual-reverse argument". Both of the conclusions and premises of the arguments are ambiguous and open to more than one interpretation. This paper separates epistemological and ontological aspects of each argument and after advancing their logical structures assess each one. On authors' opinion none of them can fulfill neither to prove the belief of people of justice ('Adliyya) nor invalidate their opponents' theory.