Great advice from an interview with J.I. Packer about leading small group Bible studies (bolding is my emphasis):

"I try to lead Bible studies myself, and I will tell you what I do. Keep the monologue introducing the passage down to the minimum. Ask questions that make other people do the thinking and the talking, to get to the heart of the passage. Don’t let people wander far from what the passage is saying. Keep asking questions that bring them back to the passage and make them think about the application: If this is true, if this is what is meant, how does it bear on our lives?
"I don’t think it is profitable to spend a lot of time trying to get people to work out a difficult bit of interpretation that you could get from a commentary. It is better that the leader should say, “There is a strange sentence here, and you have to know a bit of the background. The commentaries tell you the backgroundit— is this, so this is the meaning and this is the principle. Now the question for us is how we turn it into living for today.”
"Avoid getting hung up on things that are simply speculative—people guessing in the absence of knowledge. Instinctively we dislike practical issues of obedience. We would much rather speculate about high and obscure matters like predestination, you know. I don’t think that any Bible study profits if it is allowed to veer into speculation. If some speculative subject is raised, it is much better to ask somebody who knows something to come and give a talk on the subject. But keep the group Bible study down to practicalities—matters of how you live for the Lord, how you walk with Christ how you obey."

(from Discipleship Journal, Issue 10, 1982)