"Shortly before the foreign invasions began from the 11th century onwards, the Hindu body politique was fast losing the two invaluable qualities of colonisation and proselytisation so indispensable for the self-preservation and continuance of a race or people and its culture. On the other hand, the new foreign invaders who were of Muslim religion were aggressive proselytisers, with the consequence that instead of Muslims being converted to Hinduism, many Hindus became Muhammadans. Hindu Society was now on its trial. Nevertheless, it wonderfully began to tide over this crisis by reclaiming most of the Hindus that were being converted to Muhammadanism. Śud'dhi movement in India began, not recently with the Arya Samajists re-converting the Muhammadan Malkana Rajputs, but in the tenth century."
January 1, 1970
https://en.wikiquote.org/wiki/D.R._Bhandarkar