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== Introduction ==
Dharmashastra works are related to the society and are bound to display changes and modifications in the traditions as we see them from dharmas in Shrutis to Nibandhas. The conduct of man has reference to his surroundings as well as to himself. The concept of "two sides of a coin" such as right and wrong, the good and bad, love and hate etc all depend upon the scheme of evolution of the beings and cannot be described independently of that scheme. Thus the determination of what is right or good has to be done carefully for the higher good of existence and not just individuals or a class of beings. Any such judgement has to be in congruity with the general goal of human evolution. Reference to many such details have been supplied to us by the rshis and maharshis, who have not only left the scheme of evolution of our world systems, but also have left to us the general rules for dealing with human, other forms of life as well as inanimate things.<ref name=":022">''Sanatana Dharma : An Advanced Textbook of Hindu Religion and Ethics''. (1903) Benares : The Board of Trustees, Central Hindu College</ref>
For instance, the dharmas for the four Ashramas refer to the facts and laws of individual evolution; and the dharmas for the four Varnas deal with the facts and laws of human evolution at large, including those about laws for ruling the states, division of labour and social organization. The conditions of the Ashramas and Varnas exhaust all possible situations in the whole life of the present day humanity, thus many rules of Sanatana Dharma are applicable in modern day socio-economic situations.