What does Proverbs 29:19 mean?

As a general-case statement, the lesson here reminds that empty words are not enough to maintain order. For servants—or, in a modern context, employees—a manager needs to be ready to enact consequences. If it becomes clear that the only response to disobedience is a lecture, defiance will only increase. A common English expression is "he's all talk." This refers to someone who uses words, but never backs them up with actions. Scripture doesn't offer exact examples of non-verbal discipline in this situation. Today, those might mean disciplinary meetings, suspensions, loss of promotions, or even loss of one's job.

This parallels the general approach to discipline given elsewhere in the book of Proverbs. A well-meaning, discerning application of discipline is in the best interests of everyone involved (Proverbs 8:32–36; 10:17; 22:15). Appropriate actions in addition to words may persuade a wayward person to do what is right.