"This system had grown more rigid and complex since the Vedic period; not only because it is in the nature of institutions to become stiff with age, but because the instability of the political order, and the overrunning of India by alien peoples and creeds, had intensified caste as a barrier to the mixture of Moslem and Hindu blood. ...It (the caste system) offered an escape from the plutocracy or the military dictatorship which are apparently the only alternatives to aristocracy; it gave to a country shorn of political stability by a hundred invasions and revolutions a social, moral and cultural order and continuity rivaled only by the Chinese. Amid a hundred anarchic changes in the state, the Brahmans maintained, through the system of caste, a stable society, and preserved, augmented and transmitted civilization. The nation bore with them patiently, even proudly, because every one knew that in the end they were the one indispensable government of India."