There were some reprimands from parents and teachers that we never listened to because they did not really relate to us when we were young kids. Then, there were admonitions that we were given again and again- for example - from a schoolteacher who barked "Keep Quiet" mindlessly, when what you were doing was simply ask your classmate for your ruler. We never listened, right? Moreover, what young child would pay attention to "Do unto others what you want others to do unto you" or the negative form, "Do not do unto others...." It is the GOLDEN RULE, Rosalinda would say in response to a misdemeanor done.
Then, in an unexpected twist of fate you suddenly become a teacher and it all comes crystal clear - the need to teach children ETHICS - when rowdiness becomes the rule of the day. You do need to tell about the GOLDEN RULE. And never mind that they do not listen now or they think of you as obsolete, because sooner or later your wards will remember its significance as they go on to discover LIFE.