Romance in Vedic Age

They were Aryans and they laid foundation of Hindu ideology of spiritualism and universality. Thousands of people across the world from centuries wanted to understand Hindu system of life.Society flourished for about two thousand years by following Veda scripture to make life more meaningful. But why people of Vedic Age required the new scripture in the way of codified code of conduct like Manu Smriti when Vedic Age was totally dedicated and in accordance with the Vedas.