Comparison of the Philosophical and Methodological Principles of Khajeh Nasir Tusi and Sadr al-Motaalehin Shirazi in Proving The Most High Necessary Bing

The issue of proving The Necessary Bing to Muslim scholars is of particular importance, As far as theologians and philosophers have proved such a theme in their books in various ways.Khajeh Tusi also severely under the influence of peripatetic philosophical problems, and entering the content in the theological area, has given another form to the theological issues, so that, how to arrange Khajeh's arguments has been more pronounced than the preceding theologians. But on the contrary, Mulla Sadra, in the light of the establishing rules and principles of His transcendental wisdom, such as the principality of existence, gradation in the reality of existence, etc., has been proposed a new approach to the arguments of God's proof which methodologically can be investigated. Therefore the present paper, while pointing out how the various arguments and methods of Khwajah and Sadra regarding the proof of God, is explains the extent and the way of the philosophical influence of each of these two wise by descriptive-analytic method.Finally, the achievements and agreement and disagreement position of these two thinkers in the basics and methods are discussed