Sermons are great launching pad for discussion. Not only do they help you get a feel for your CBs tastes (do they have a favorite preacher, or even several favorites?), but listening to sermons together will challenge you both to think through what you are hearing to see if it is accurate. You can listen to sermons from your own church, or listen to "podcasts" online from a pastor you respect. Either way, make sure you talk about what you've heard.