The Israelites are first noticed in history as a horde of vagabond herdsmen in Mesopotamia. Oppressed by powerful neighbors, repeatedly enslaved, and reduced to those depths of moral degradation incident only to long-continued servitude, they still succeeded in preserving inviolate the principles of their religious and social organization. They were almost universally considered as outcasts, with whom it was contamination to associate. But in all their adversity their peculiar theocratic belief confirmed their resolution and sustained their hopes. They were the Chosen People of God. His Spirit was ever with them, speaking through the voices of their teachers, directing the councils of their rulers, illuminating the Holy of Holies of the Tabernacle, hovering about the Ark with its golden cherubim. They had the Divine assurance that one day their troubles would end, that the scattered members of their race would be again united, that they would inherit the kingdoms and possess the riches of the earth. Their arrogant exclusiveness was unconsciously, but none the less diligently, fostered by the prejudices and regulations of the countries within whose borders they fixed their residence. In each city they were confined to a certain quarter, within whose precincts Christian men were little disposed, and Christian women absolutely forbidden, to enter. The use of a distinctive costume, popularly regarded as a badge of ignominy, was imposed upon them. They were not allowed to marry outside their sect. The minute and innumerable restrictions of Hindu caste were not more rigid or vexatious than those ordinances which regulated the intercourse of Jew and Christian during the Middle Ages. The enforcement of these social distinctions, as well as the inexorable requirements of the laws, increased the isolation of the Jews in every community. In this manner their unity was preserved, and the extraordinary vitality which characterized their existence in all its phases was promoted.