It was not by mere chance that the first forms of civilization arose there where the Aryan came into contact with inferior races, subjugated them and forced them to obey his command. The members of the inferior race became the first mechanical tools in the service of a growing civilization.
Thereby the way was clearly indicated which the Aryan had to follow. As a conqueror, he subjugated inferior races and turned their physical powers into organized channels under his own leadership, forcing them to follow his will and purpose. By imposing on them a useful, though hard, manner of employing their powers he not only spared the lives of those whom he had conquered but probably made their lives easier than these had been in the former state of so-called 'freedom'. While he ruthlessly maintained his position as their master, he not only remained master but he also maintained and advanced civilization. For this depended exclusively on his inborn abilities and, therefore, on the preservation of the Aryan race as such. As soon, however, as his subject began to rise and approach the level of their conqueror, a phase of which
ascension was probably the use of his language, the barriers that had distinguished master from servant broke down. The Aryan neglected to maintain his own racial stock unmixed and therewith lost the right to live in the paradise which he himself had created. He became submerged in the racial mixture and gradually lost his cultural creativeness, until he finally grew, not only mentally but also physically, more like the aborigines whom he had subjected rather than his own ancestors. For some time he could continue to live on the capital of that culture which still remained; but a condition of fossilization soon set in and he sank into oblivion.
That is how cultures and empires decline and yield their places to new formations.