A Study of Fakhr Razi's Intellectual Foundations on the Quiddity of God and Its Critique from the Pointof View of Nasir al-Din Tusi

Ibn Sina, according to the general rule of "everything that has a quiddity is an effect", denies that God has a quiddity. But Fakhr Razi believes that because "existence" is abstract homonymous, so as its application in man affects the quiddity, in relation to God, it affects His quiddity. Hence, God has an essence. According to Nasir al-Din al-Tusi, Fakhr al-Razi's view arises from the fallacy between the rules of essence and existence, the rules of the mind and the outside, and the transmission of the rule of concept to the instance. It is true that according to philosophers, existence refers to its instances in one sense, but it does not need that the correlates of existence have the same essence. This article explains and analyzes the issue from Fakhr Razi's point of view in two parts: A) Providing an argument to prove the quiddity of the necessary existent, B) Criticizing the theory that the necessary existent does not have quiddity, and expressing Nasir al-Din Tusi's critique of Razi's view along with analyzing and criticizing the reasons of both thinkers.