The differences of character between the German and Keltic varieties of the human race are marked, but not extreme. They both belong to the same great Indo-European or Aryan family. They both originated in Asia, and the German emigration seems to have followed immediately after that of the Kelts. Yet when described by Cæsar, Tacitus, and Strabo, they differed from each other exactly as they differ now. They have lived for some two thousand years in the same climate, under similar political and social institutions, and yet they have preserved their original diversity. According to the description of Cæsar[30] and Tacitus[31] the German tribes differed essentially from the Gauls or Kelts in the following particulars. The Germans loved freedom, and were all free. The Kelts did not care for freedom. The meanest German was free. But all the inferior people among the Kelts were virtually slaves. The Germans had no priests, and did not care for sacrifices. The Kelts had a powerful priesthood and imposing religious rites. The Germans were remarkable for their blue eyes, light hair, and large limbs. The Kelts were dark-complexioned. The Gauls were more quick, but less persevering, than the Germans. Ready to attack, they were soon discouraged. Tacitus, describing the Germans, says: "They are a pure, unmixed, and independent race; there is a family likeness through the nation, the same form and features, stern blue eyes, ruddy hair; a strong sense of honor; reverence for women; religious, but without a ritual; superstitiously believing in supernatural signs and portents, but not in a priesthood; not living in cities, but in scattered homes; respecting marriage; the children brought up in the dirt, among the cattle; hospitable, frank, and generous; fond of drinking beer, and eating preparations of milk."