 He believed that traditions such as sati, enforced widowhood and child marriage developed from the need to reinforce endogamy and Shastras were used to glorify these practices so that they are observed without being questioned.Later, other caste groups imitated these customs.However, although Ambedkar uses the approach of psychologist Gabriel Tarde to indicate how the caste system spread, he also explains that Brahmins or Manu cannot be blamed for the origin of the caste system and he discredits theories which trace the origin of caste system in races.