Once a wise teacher was walking from one town to another town with a few of his followers. As they walked, they passed a lake. They stopped to rest in the shade of some trees and the teacher remarked to one of his disciples that he was thirsty and asked him to get some water from the lake. The disciple walked up to the water’s edge. When he reached it, he noticed that some people were washing clothes in the water and, right at that moment, a bullock cart started crossing through the lake.