عنوان مقاله [English]
نویسندگان [English]چکیده [English]
Avicenna and his followers believe that when the soul perceives the matter in the world, it communicates with external world through its faculties and its tools; so a similar quality of object quality is imprinted firstly on the tool of perception, then on faculties and finally on the atmosphere of soul in the light of this connection. This imprinted form in order to refer to the external world is the criterion for soul knowledge to sensuous world. The principality of existence to Avicenna's theory of knowledge entails the impossibility of unity of quiddity of external being with mental being because of mixing of two different levels of being. The principality of quiddity to Avicenna's theory of knowledge entails transmitting the principal object (quiddity) to mind. It is an absurdity because of impossibility of transmitting the principal object. Even accepting the transition, transition with external effects entails mutation in essence and transition without them entails disjoining adherents from essence.