Unity of Mankind 

   
The Buddha taught not only the necessity of an inner revolution of the individual for human happiness but also the need for an outer revolution in the life of society. thus, for instance he preached the fundamental oneness and unity of mankind, irrespective of colour or race physiological characteristics as in the case of animals and created a revolution for the abolition of the cast system which was prevalent in india in his day. In order to demonstrate his concept of the oneness of mankind and he moved not only with king and capitalists and aristocratic ladies , but also with the poorest of the poor, with beggars and scavengers, robbers  and courtesans.