An exceedingly confident student would in theory make a terrible student. Why would he take school seriously when he feels that he can outwit his teachers?
One voice can change a room, and if one voice can change a room, then it can change a city, and if it can change a city, it can change a state, and if it change a state, it can change a nation, and if it can change a nation, it can change the world. Your voice can change the world.