Received: 16 October 2017 Accepted: 24 November 2017 Published: 01 December 2017
Epistemology has not been stated as an independent discussion in primitive books. Following Kant it was appeared as a dependent field. Independent subject matter was not expressed in this issue, albeit in Islamic philosophy. However, the bases of epistemological discussions have applied in the heart of other philosophic topics. One of the primary topics which assuredly relates to major topics of epistemology is subjectivity discussion. Meanwhile it will be explained that how it is possible to escape sophistry and attain real cognition and object knowledge. The present paper firstly has attempted to design mental existence issue and advocates–stated problems and then indicates Mulla Sadra’s initiative to respond the problems and solve mental existence issue.