Bad language is a stage all children go through, and it dies with time when they learn they’re not attracting attention with it.
 Harper Lee, To Kill a Mockingbird (1960). copy citation

Context

“But don’t make a production of it. Children are children, but they can spot an evasion quicker than adults, and evasion simply muddles ‘em. No,” my father mused, “you had the right answer this afternoon, but the wrong reasons. Bad language is a stage all children go through, and it dies with time when they learn they’re not attracting attention with it. Hotheadedness isn’t. Scout’s got to learn to keep her head and learn soon, with what’s in store for her these next few months. She’s coming along, though. Jem’s getting older and she follows his example a good bit now.” source