_Important Factors in the Foundation of Western Civilization_.--When the European world entered the period of the Middle Ages, there were a few factors more important than others that influenced civilization.[1] (1) The Oriental cultures, not inspiring as a whole, left by-products from Mesopotamia, Palestine, and Egypt. These were widely spread through the influence of world wars and world empires. (2) The Greek cultures in the form of art, architecture, philosophy, and literature, and newer forms of political and social organization were widely diffused. (3) The Romans had established agriculture, universal centralized government and citizenship, and developed a magnificent body of law; moreover, they had formed a standing army which was used in the support of monarchy, added some new features to architecture and industrial structures, and developed the Latin language, which was to be the carrier of thought for many centuries. (4) The Christian religion with a new philosophy of life was to penetrate and modify all society, all thought, government, law, art, and, in fact, all phases of human conduct. (5) The barbarian invasion carried with it the Teutonic idea of individual liberty and established a new practice of human relationships. It was vigor of life against tradition and convention. With these contributions, the European world was to start out with the venture of mediaeval civilization, after the decline of the Roman Empire. _The Social Contacts of the Christian Religion_.--Of the factors enumerated above, none was more powerful than the teaching of the Christians. For it came in direct contrast and opposition to established opinions and old systems. It was also constructive, for it furnished a definite plan of social order different from all existing ones, which it opposed. The {269} religions of the Orient centred society around the temple. Among all the Semitic races, Babylonian, Assyrian, and Hebrew, temple worship was an expression of religious and national unity. National gods, national worship, and a priesthood were the rule. Egypt was similar in many respects, and the Greeks used the temple worship in a limited degree, though no less real in its influences. The Romans, though they had national gods, yet during the empire had liberalized the right of nations to worship whom they pleased, provided nothing was done to militate against the Roman government, which was committed to the worship of certain gods, in which the worship of the emperor became a more or less distinctive feature. The Christian teaching recognized no national gods, no national religion, but a world god who was a father of all men. Furthermore, it recognized that all men, of whatsoever race and country, were brethren. So this doctrine of love crossed boundaries of all nations and races, penetrated systems of religion and philosophy, and established the idea of international and universal brotherhood.