If something could boast of the ancient Greek world for its contribution to this global culture should be the development of philosophical thought. The search for "laws", i.e. the rules governing the nature and binding together, shifted the centre of human thought from the man himself, in the world, in the universe. His search starts with the pre-Socratic philosophical schools and reaches its peak, with the two main proponents of ancient intellect, Plato first and Aristotle's pupil. The contribution of Aristotle (...) particularly could be focused on the attempt to answer the problem of truth. For Aristotle, the search for truth sits in this thing and the intellectual space and the subjective judgment based on reasoning and evidence. Even the metaphysical thought of Aristotle, about God's problem, recommends the apotheosis of reason. The existence of God is a rational truth, it is the reason, and the truth because it fits with the being, the thing. The thought of Aristotle about the existence of God is identified with the existence of God, therefore God exists and proving that it exists. The mind can match things and establish the truth of the existence of God. In this rational metaphysics Aristotelian awareness of the existence of God, in which God, according to Aristotle, moves all other beings, but he remains motionless because it is not material and therefore not have the need of movement, at rival of the Christian philosophy. The Christian philosophy puts the concept of the person, so selfishness and diversity as a means of approach to God through the process of experience. Which is the common point between Aristotle and Christian Philosophy. In their attempt to investigate the relationship of being concerning the ontological beings and the reflection on the Being. (shrink)