The qualified monism of Râmânuja (as his system is sometimes called) led to more uncompromising treatment of the question and to the affirmation of dualism, not the dualism of God and the Devil but the distinctness of the soul and of matter from God. This is the doctrine of Madhva, another southern teacher who lived about a century after Râmânuja and was perhaps directly influenced by Islam. But though the logical outcome of his teaching may appear to be simple theism analogous to Islam or Judaism, it does not in practice lead to this result but rather to the worship of Krishna. Madhva's sect is still important but even more important is another branch of the spiritual family of Râmânuja, starting from Râmânand who probably flourished in the fourteenth century[28]. Râmânuja, while in some ways accepting innovations, insisted on the strict observance of caste. Râmânand abandoned this, separated from his sect and removed to Benares. His teaching marks a turning-point in the history of modern Hinduism. Firstly he held that caste need not prevent a man from rightly worshipping God and he admitted even Moslims as members of his community. To this liberality are directly traceable the numerous sects combining Hindu with Mohammedan doctrines, among which the Kabir Panthis and the Sikhs are the most conspicuous. But it is a singular testimony to the tenacity of Hindu ideas that though many teachers holding most diverse opinions have declared there is no caste before God, yet caste has generally reasserted itself among their followers as a social if not as a religious institution. The second important point in Râmânand's teaching was the use of the vernacular for religious literature. Dravidian scriptures had already been recognized in the south but it is from this time that there begins to flow in the north that great stream of sacred poetry in Hindi and Bengali which waters the roots of modern popular Hinduism. Among many eminent names which have contributed to it, the greatest is Tulsi Das who retold the Ramayana in Hindi and thus wrote a poem which is little less than a Bible for millions in the Ganges valley.