In the 70's, 80's and mid 90's, there was a man who had the gift of teaching and was very good at defending the faith and explaining theology to the common man. He participated in some debates at universities, as well as traveled to churches and conferences to share the details of the Christian faith. He helped Christians to get "depth of soil" for their spiritual lives. Fortunately his teachings were often recorded. There are a total of 1,675 sermons and lectures that were recorded. These audio teachings used to be available only by purchase. Now, there is a new project afoot, that makes this massive library of audio recordings, available for free to families. These could be used for training in the home as well as a Sunday School class, or Christian school. They are ideal for self-study. Of particular interest may be homeschoolers. Some of the recordings are intended as longer courses, such as the titles: "Systematic Theology," "Exposition of the Westminster Confession of Faith (WCF)", "Revelation Sermon Series," and the extensive teaching on Calvin's Institutes. These are all free, thanks to the work of The Bahnsen Project.
If you want to visit Sermon Audio and find out more, simply go there and do a search for Greg L. Bahnsen.
Here is a link to a sample sermon, that has some hiss in it but is very worthwhile listening to:
https://www.sermonaudio.com/search.asp?sourceonly=true=sermonssource=thebahnsenproject=series=Develop+Christian+Worldview
Participants: Graham Dugas, Dan Elmendorf