The sermon explores the concept of spiritual darkness as a state of vanity, sorrow, and disconnection from God, using Ecclesiastes 5:17 as the primary text. It contrasts this condition with the biblical narrative of light, tracing the theme from Genesis to the New Testament to illustrate how humanity is born into a state of obscurity and error. The message emphasizes that salvation is a sovereign act of God who delivers believers from the power of darkness into the kingdom of His Son, enabling them to see the glory of Christ. Through the analogy of the blind man in John 9 and the plagues of Egypt, the sermon highlights that while the unregenerate are locked in thick darkness, God's people possess light and are called to reflect the praises of Him who has redeemed them. Ultimately, the tone is instructional and comforting, affirming that grace transforms the believer's perspective from one of stumbling in the dark to one of clear sight and purpose.