Understanding vs behavior

Mr. B.’s school problems are starting early this year. Yesterday, after pickup, he gave me a very pious and unprompted lecture about how he–unlike some of his pals–knows better than to take his Yu-Gi-Oh cards to school to trade on the playground at recess. Teachers, who consider such things a distraction, don’t like to see them except, now and then, at show-and-tell. But behavior, of course, doesn’t always follow from understanding. This morning Mr. B.’s mom caught him trying to take a handful of the cards to school. She insisted that he leave them at home. He did, but he didn’t like it.