Ghazali has from outset been considerd as one who occupied the peak point in the history of Islamic Thought. By Ghazali?s time, Islamic sciences had been fully developed, so he had the chance of finding them readily before him. He, naturally, summed them up in Philosophy, Theology, Islamic Mysticism, Logic, etc. But when he tried to develop these sciences further, he went throught some difficulties and it seems likeley that this gave rise a mental crisis in Ghazali. This same motive combined with political upheavels in his time seems to have led him this crisis and finaly to seek for mysticism as a final point to settle down. Another importan figure to be pointed out in our study is Ibn Rushd both as a critic to Theologians and their argumantation modes and as a philosopher and commentator of Aristotle.