The sermon was morality taught people katha. The instructions specifically teaching discipline into a place listeners to beware of sangwon. Do not do evil, the evil good, and good security.
Speech doctrine is to teach the people the moral teachings advice counsel specific to a particular subject. To give the listener a wary watch. No evil To turn away from evil and do good to maintain it.
Rebellious words is to teach moral to the people, advice, warning the teachings by specific to a particular subject. So the audience was wary careful, no evil to evil, to do good, and keep the good.