Why we Disagree?

In the Chicago 1893 speech, Swami Vivekananda tried to explain the reason of disagreement between each other and different sects and religions. He told a story of a frog. In the story he told, a frog used to live in a well. It was born there and brought up there and it used to think his well was the biggest water land of the world. One day, a frog from a sea came to that well. When the frog from the sea told the frog of the well that sea is much bigger than that well, the frog of the well did not believe it and drove the frog of the sea away from his well. Vivekananda concluded– "That has been the difficulty all the while. I am a Hindu. I am sitting in my own little well and thinking that the whole world is my little well.
The Christian sits in his little well and thinks the whole world is his well.
The Muslim sits in his little well and thinks that is the whole world."
In this brief address Vivekananda made a "little criticism" and told, religion was not the most important need of Indians at that moment. He regretted for sending Christian missionaries and trying to save the souls of Indians although poverty had been a much more important issue at that time.