''Obedience...is the primary object of all sound education."

                               ~Elizabeth Missing Sewell

I think what Mary is trying to say is that obedience will take you far in education. You have to be obedient to learn or else you won't learn a thing. Being obedient will help you a lot in educational purposes because you choose to obey to listen and you choose to follow along. Being obedient can also help you collaborate with others in a class. Without obedience, we wouldn't have doctors, or firefighters. The policies, doctors, lawyers, we see today once were in our shoes. They all chose to obey and they became something great in life. Of course when they went to school some people didn't obey. They disobeyed and life became a failure.  The reason why is because they chose to disobey and they chose not to learn. Some of them even regret not learning. In my opinion, is that I will obey my teachers. I want to become something great in life, and it all starts here in school. 

Elizabeth M. Sewell
1815-1906