some have denied the reality of Islamic Philosophy because inductive reasoning and philosophy are not dedicated to the Islamic realm. With regard to rational essence of Islam, if the approaches of the philosophy of man (human) and world knowing (which have mentioned in the religious texts and sources) are adopted and defined we will access to the fundamental factors of Islamic philosophy. Hence, these researches and findings are one of the main Muslim philosophers’ interests. Meanwhile, they believe that philosophy has a rational essence and is not specified to Islam, believing the reasoning bases of the religious thought; they were redirected to investigate such researches. Philosophical theism in the speech of Imam Reza (p.b.u.h) is a partial effort which is formed according to this belief and the manner of the scholars and has pointed out some of the most knowing approaches in Imam’s speech. It consist of order, necessary, contingent, motion, substantial motion and nature arguments and argument of Oneness and unity of God, the argument on neglecting (not being essence), the argument of not being God matter, the argument of unity Being of God, the argument of pure Being, absolute unity, not being relying on the nature of Truth, names and attributes of the almighty Truth, the relation between the Creator and creation.