What concern does Les have about preaching and teaching from the Word today?
The concern is that people across the land are not receiving in-depth preaching or teaching from the Word. Much of it remains shallow, including Sunday School material, and does not get into the deep things. Paul admonishes believers to let the Holy Spirit take them into the deep things of God's Word.
Les explains that his concern comes from what he hears from people all across the land: they are not getting in-depth preaching or teaching from the Word. It is all so shallow, and he has felt that way for years. He notes that too much Sunday School material, as good as it may be, is still shallow and does not get into the deep things. Paul is admonishing that believers have to let the Holy Spirit take them into the deep things of God's Word. The Spirit communicates these things from the Word of God to believers, while the unbelieving world has no idea what eternity holds.