Chaturvarnya is not new. It is as old as the Vedas. That is one of the reasons why we are asked by the Arya Samajists to consider its claims. Judging from the past, as a system of social organization it has been tried and it has failed. How many times have the Brahmins annihilated the seed of the Kshatriyas! How many times have the Kshatriyas annihilated the Brahmins! The Mahabharata and the Puranas are full of incidents of the strife between the Brahmins and the Kshatriyas. They even quarreled over such petty questions as to who should salute first, as to who should give way first, the Brahmins or the Kshatriyas, when the two met in the street.
[2:] Not only was the Brahmin an eyesore to the Kshatriya and the Kshatriya an eyesore to the Brahmin, it seems that the Kshatriyas had become tyrannical, and the masses, disarmed as they were under the system of Chaturvarnya, were praying to Almighty God for relief from their tyranny. The Bhagwat tells us very definitely that Krishna had taken avatar for one sacred purpose: and that was, to annihilate the Kshatriyas. With these instances of rivalry and enmity between the different Varnas before us, I do not understand how anyone can hold out Chaturvarnya as an ideal to be aimed at, or as a pattern on which the Hindu Society should be remodelled.
[ This is the part 18 of the book Annihilation of Caste written by Dr Ambedkar. Annihilation of Caste is an undelivered speech written in 1936 by B. R. Ambedkar. B.R. Ambedkar was the first highly educated, politically prominent Dalit. He wrote The Annihilation of Caste for the 1936 meeting of a group of liberal Hindu caste-reformers in Lahore ]