John Nelson Darby expounds on the significance of Moses veiling his face after encountering God's glory, contrasting it with the unveiled glory of God revealed in Jesus Christ. He emphasizes that the law, while a revelation of God's holiness, ultimately leads to condemnation, whereas the gospel of grace offers liberty and a direct relationship with God. Darby highlights that true knowledge of God comes from understanding His perfect love and grace, which is fully manifested in Christ, allowing believers to stand confidently in His presence without fear of condemnation. The sermon calls for a clear distinction between law and grace, urging believers to embrace the fullness of God's revelation in Christ for true peace and assurance.