According to Stephanie Jamison and Joel Brereton, a professor of Sanskrit and Religious studies, "there is no evidence in the Rigveda for an elaborate, much-subdivided and overarching caste system", and "the varna system seems to be embryonic in the Rigveda and, both then and later, a social ideal rather than a social reality". Historian R. S. Sharma states that "the Rig Vedic society was neither organized on the basis of social division of labour nor on that of differences in wealth... was primarily organised on the basis of kin, tribe and lineage."