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.