"Brahmin writers have not only codified and justified the existing caste system, and possibly hardened it; in the final editing of many influential classics of Puranic Hinduism, they have also unnecessarily extended caste distinction beyond the social sphere, incorporating spiritual liberation in the calculus of karma and caste duties.... 'There has been an enormous shift in attitudes between the period of the former, among the earlier additions, and the latter, among the latest parts included in the text', viz. an appalling hardening of caste discrimination. The harsh caste discrimination of recent centuries is a vaguely datable innovation in Hindu social history, not an age-old conditions.... This contrast between less casteism in antiquity and more casteism in the Christian era is even proven by Buddhist anti-caste polemic itself. As Maurice Winternitz ... notes about the Vajrasûchî, a text attributed to the Brahmin-born monk Ashvaghosha: 'This work refutes the Brahmanical caste system very cuttingly. The author (...) seeks to prove from the Brahmanical texts themselves, by quotations from the Veda, the Mahâbhârata and the law book of Manu, how frail the claims of the Brahman caste are.'"