Two sages and a poet
If rivers irrigate a country, poets irrigate the people. Poets are the rivers of metaphors that work on the genetics of the human race.
While Sindhu and Ganga were the centers of Indian culture, Valmiki and Vyasa were the sources of Indian culture. After the center of gravity shifted in Indian life from Sindhu to Ganga, that is, after the Vedic period expired, the new era of epic was opened by the great sage Valmiki. There are no references to the river Sindhu in Ramayana whereas there are innumerable references to Ganga indicting the river's exalted place among the sacred rivers of India.
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