Emerson has said that consistency is a virtue of an ass. No thinking human being can be tied down to a view once expressed in the name of consistency. More important than consistency is responsibility. A responsible person must learn to unlearn what he has learned. A responsible person must have the courage to rethink and change his thoughts. Of course there must be good and sufficient reason for unlearning what he has learned and for recasting his thoughts. There can be no finality in rethinking.

B. R. Ambedkar