This he did in his "Guide of the Perplexed" (_Moreh Nebuchim_). Maimonides here differed fundamentally from his immediate predecessors. Jehuda Halevi, in his _Cuzari_, was poet more than philosopher. The _Cuzari_ was a dialogue based on the three principles, that God is revealed in history, that Jerusalem is the centre of the world, and that Israel is to the nations as the heart to the limbs. Jehuda Halevi supported these ideas with arguments deduced from the philosophy of his day, he used reason as the handmaid of theology. Maimonides, however, like Saadiah, recognized a higher function for reason. He placed reason on the same level as revelation, and then demonstrated that his faith and his reason taught identical truths. His work, the "Guide of the Perplexed," written in Arabic in about the year 1190, is based, on the one hand, on the Aristotelian system as expounded by Arabian thinkers, and, on the other hand, on a firm belief in Scripture and tradition. With a masterly hand, Maimonides summarized the teachings of Aristotle and the doctrines of Moses and the Rabbis. Between these two independent bodies of truths he found, not contradiction, but agreement, and he reconciled them in a way that satisfied so many minds that the "Guide" was translated into Hebrew twice during his life-time, and was studied by Mohammedans and by Christians such as Thomas Aquinas. With general readers, the third part was the most popular. In this part Maimonides offered rational explanations of the ceremonial and legislative details of the Bible.