This is so true. The same goes for what it means to be a "good student." Everyone knows the difference between right and wrong. Just as everyone knows what is "healthy" to eat and what is not. The teacher should have to continually tell you "no." We are all, for the most part, grown ups and can act accordingly. “Yaiba ni tsuyoki mono wa rei ni suguru” means that the greatest warriors surpass all others in etiquette and decorum. From an 1856 newspaper article from England:
Mr. Wiseman then cautioned his young friends as to the habits they contracted in early life:—”Whatsoever a man soweth that shall he also reap.” You sow an act, you reap a habit (acts repeated constitute habits); you sow a habit, you reap a character; you sow a character, you reap a destiny. Let them, he said, cultivate habits of industry, application, and order, and they might rely upon it, with God’s blessing, they would succeed in life.
Please be mindful about not only what you say and do, but in what you think. It really does matter.