“Let us consider an illustration. Imagine that a teacher is telling his students how to solve a difficult problem. A clever but rebellious student claims that the teacher’s way of solving the problem is wrong. Implying that the teacher is not capable, this rebel insists that he knows a much better way to solve the problem. Some students think that he is right, and they also become rebellious. What should the teacher do? If he throws the rebels out of the class, what will be the effect on the other students? Will they not believe that their fellow student and those who joined him are right? All the other students in the class might lose respect for the teacher, thinking that he is afraid of being proved wrong. But suppose that the teacher allows the rebel to show the class how he would solve the problem.