Many teachers struggle with incorporating discussions into their classes because they feel their job is to “teach,” i.e., give information. And when they don't give information, they feel guilty, as though they have not done what they are supposed to do. Let's begin this journey by emphasizing that you don't need to feel that you cannot share new information with your class. After all, you have studied the details of the lesson, and you feel that you have something to say. That is fine! Say it! But how do you know if your students understood what you said correctly? Or just as importantly, hopefully, your students have studied their lesson as well, and they have learned things in the process that they are excited about and want to share. Class involvement meets both of those needs. From the feedback you get, you will know if you have stated your points clearly, and you will also have the advantage of learning from your students. It is OK to be the “sage on the stage” part of the time. But balance that with being a “guide on the side.” Your students will retain most of what they have been allowed to restate in their own words!
Source: Snider, Gordon. "Tips for Teachers." The Church: God's People: Adult Teacher's Insights, page 9.