The sermon distinguishes between the completed inspiration of Scripture and the ongoing ministry of illumination by the Holy Spirit. It emphasizes that while God authored the Bible, believers must pray for spiritual insight to truly comprehend its truths. Drawing from Psalm 119 and 1 Corinthians 2, the text argues that natural intellect alone cannot grasp divine revelation without the Spirit's work. The preacher urges the audience to approach Scripture with humility and prayer, seeking the Spirit's guidance to apply God's Word effectively to their lives.