One thing that stands out clear and unmistakable is that the civilization revealed at Indus Valley is not incipient, but one already age-old and stereotyped on Indian soil, with many millenniums of human endeavor behind it
Caste began with a hard and fast division between Aryans and non-Aryans, the latter again being divided into the Dravidian races and the aboriginal tribes.
In Rig Veda we can find the first outpourings of the human mind, the glow of poetry, the rapture at nature's loveliness and mystery. And the beginnings of the brave adventures