"The only explanation is to be found in the Mahabharata, which says that in the beginning of the Satya Yuga there was one caste, the Brahmins, and then by difference of occupations they went on dividing themselves into different castes, and that is the only true and rational explanation that has been given. And in the coming Satya Yuga all the other castes will have to go back to the same condition."