Once during his stay in the US, an American asked Swami Vivekananda, "How do people in India stay together? Where does the unity come from when there is so much disparity in their colours? Some are dark, some are brown, some are red and some even fair !! Here in the US, everyone is of the same colour, viz white!!" 

To this, Vivekananda repiled,"Have you seen horses? They are all of different colours, yet they stay together. On the other hand, have you seen donkeys? They are all of the same colour. Now you tell me, does that make the horses inferior to the donkeys?"

The questioner stood dumbstruck at this answer.