Caste is a state of mind. It is a disease of mind. The teachings of the Hindu religion are the root cause of this disease. We practice casteism and we observe Untouchability because we are enjoined to do so by the Hindu religion. A bitter thing cannot be made sweet. The taste of anything can be changed. But poison cannot be changed into nectar.

Dr. Babasaheb Ambedkar, Writings and Speeches (ed. 2003)