What interests us here is the assimilative power of the Hindu life order due to its legitimation of social rank. Religion of India (1916)
Legitimation by a recognized religion has always been decisive for an alliance between politically and socially dominant classes and the priesthood. Integration into the Hindu community provided such religious legitimation for the ruling stratum. It not only endowed the ruling stratum of the barbarians with recognized rank in the cultural world of Hinduism, but, through their transformation into castes, secured their superiority over the subject classes with an efficiency unsurpassed by any other religion. Religion of India (1916)