Who is a brahmin? Here's an interesting parable.
Guru Nanak looked at the Brahman and said, “Why do you throw water to the sun?” The priest said proudly, “We throw water to the sun to honor our ancestors, it gives them happiness, blessings and prosperity.” “So, how far away are your ancestors?” Asked the Guru. A man nearby heard this conversation. He had read a lot of books, so he thought he had the right answers to everything. He said, “Our ancestors live thousands and thousands of miles away.”
The Guru started throwing water in the direction away from the sun. He was throwing the water faster and faster now, as though he was putting out a fire. As he splashed the water around, the Brahmans yelled, “STOP, STOP, what are you doing!!?” Guru Nanak was panting from all his splashing. He told them, “I have a farm in the Punjab which is in this direction. My fields really need water, especially at this time of year. If I don’t get this water over to them, my crops might dry up!”
Now they really thought he was totally crazy. One of them asked, “How can water get from here all the way to the Punjab?!” The Guru said, “Well, my farm is much closer than your ancestors. How can water reach your ancestors if it can’t even reach my farm in Punjab?” Well, it was true - his fields were much closer than the ancestors who, according to the Brahmins were thousands and thousands of miles away.