List of Articles Quiddity Open Access Article Abstract Page Full-Text 1 - Historical Development and Pre-Suppositions of the Theory of the Principiality of Existence in Tusi’s Analysis Hashem Ghorbani Open Access Article Abstract Page Full-Text 2 - Suhrawardi’s Background in Advocating Mentally-Positedness of Existence Mahmoud Hedayatafza Zeynab Bostani Open Access Article Abstract Page Full-Text 3 - On the Translation of Aristotle’s Ousia as Substance Hamid Khosravani Hamidreza Mahboobi Arani Seyyed Mohammad Ali Hodjati Open Access Article Abstract Page Full-Text 4 - Principiality of Existence and Change in the Logic of Definition Musa Malayeri Open Access Article Abstract Page Full-Text 5 - A Study of Mulla Sadra’s Ultimate View of the Meaning of the “Mentally-Positedness of Quiddity” Seyyed Shahriyar Kamali Sabziwari Open Access Article Abstract Page Full-Text 6 - Range of the Interpretations of Quiddative Concepts Based on the Principiality of Existence in the View of Contemporary Commentators of Sadrian Wisdom Rohollah Adineh Roghayeh Mosavi Open Access Article Abstract Page Full-Text 7 - A Review of Mullā Ṣadrā’s Responses to the Problem of the Necessity of Subsuming One Quiddity into two Categories in the Discussion of Mental Existence Mohammad Hadi Tavakkoli Open Access Article Abstract Page Full-Text 8 - A Critical Study of Suhrawardī’s Method of Defining Things Mohammad Hosseinzadeh Open Access Article Abstract Page Full-Text 9 - Problem of Attributing Quiddity to Existence in Seyyed Ṣadr al-Dīn Dashtakī and an Evaluation of Mullā Ṣadrā’s Narration of his Views Seyyed Ahmad Hosseini Sangchal Open Access Article Abstract Page Full-Text 10 - Three Modalities of Being Based on Mullā Ṣadrā’s Three Philosophical Approaches Ali Babaei Open Access Article Abstract Page Full-Text 11 - A Study of the Development of Natural Universal in Islamic Philosophy Javad Soufi Open Access Article Abstract Page Full-Text 12 - Historical Background of the Theory of Corporeal Resurrection in Mīr Dāmād’s Philosophy Hadi Mousavi