Does God want every believer, not just leaders, to study and understand the Scriptures?
Yes. God intends for every single believer, not just seminarians or preachers, to study the Scriptures and understand them. The church is made up of the common, ordinary person in the pew, and His Word should be in the hands of all, no matter how uneducated.
Les explains that in verse 10 God revealed the mystery so that the manifold wisdom of God might be made known by the church. The church is not limited to seminarians or preachers; it is everybody, the common ordinary person in the pew. Les points to Tyndale, who wanted to get the Word of God into the hands of every plow boy in England, meaning no one was too uneducated to have the Word of God. This is what God intends: He wants every single believer to study the Scriptures and understand them. Les adds that nothing thrills him more than when someone says they disagree with him but have determined to start studying their Bible.