Wang Wei's sermon covered many things. These people now had an excellent understanding of the cultivation realms from Body Refining to Primordial Spirit. They understood which part of Essence, Qi, and Spirit each realm was based on. With this knowledge, they can easily enter these realms and push them to their limits if they are talented enough.
For the Law aspect, Wang Wei talked about the Five Elements Law and a bit about his Fate Law. However, he primarily focused on the subtle control of the law, and with his Force Control Skill, every individual–including the True Monarchs of the sect.
Today's preaching will benefit every single listener until they become Quasi-Emperors. And maybe even further.