Selections From the Upanishads. E-book. Formato PDF Edward Röer   -  Forgotten Books, 2017  - 

Course of Hindu Thought — India was first occupied by non Aryan races, generally like the wild tribes still found in various parts of the country, although some had attained an elementary civilisation. Their religion apparently consisted in propitiating the demons and tutelary gods which, to the present day, forms the actual cult of the masses.