10. The medieval Jewish thinkers therefore made redoubled efforts to express with utmost clearness the doctrine of God’s unity. In this effort they received special encouragement from the example of the leaders of Islam, whose victorious march over the globe was a triumph for the one God of Abraham over the triune God of Christianity. A great tide of intellectual progress arose, lending to the faith of the Mohammedans and subsequently also to that of the Jews an impetus which lasted for centuries. The new thought and keen research of that period had a lasting influence upon the whole development of western culture. An alliance was effected between religion and philosophy, particularly by the leading Jewish minds, which proved a liberating and stimulating force in all fields of scientific investigation. Thus the pure idea of monotheism became the basis for modern science and the entire modern world-view.(219) 11. The Mohammedan thinkers devoted their attention chiefly to elucidating and spiritualizing the God idea, beginning as early as the third century of Islamism, so to interpret the Koran as to divest God of all anthropomorphic attributes and to stress His absolute unity, uniqueness, and the incomparability of His oneness. Soon they became familiar with neo-Platonic and afterward with Aristotelian modes of speculation through the work of Syrian and Jewish translators. With the help of these they built up a system of theology which influenced Jewish thought also, first in Karaite and then in Rabbanite circles.(220) Thus sprang up successively the philosophical systems of Saadia, Jehuda ha Levi, Ibn Gabirol, Bahya, Ibn Daud, and Maimonides. The philosophical hymns and the articles of faith, both of which found a place in the liturgy of the Synagogue, were the work of their followers. The highest mode of adoring God seemed to be the elaboration of the idea of His unity to its logical conclusion, which satisfied the philosophical mind, though often remote from the understanding of the multitude. For centuries the supreme effort of Jewish thought was to remove Him from the possibility of comparison with any other being, and to abolish every conception which might impair His absolute and simple unity. This mental activity filled the dwellings of Israel with light, even when the darkness of ignorance covered the lands of Christendom, dispelled only here and there by rays of knowledge emanating from Jewish quarters.(221)