In this sermon from John 3:9-15, Pastor Rockhill draws a sharp distinction between merely knowing about the truth and actually believing it. His central burden is that knowledge of Scripture, however vast, profits nothing apart from saving faith, and that such faith is impossible without the regenerating work of the Holy Spirit. He illustrates this with the figure of Nicodemus, "the teacher of Israel," a learned and revered Pharisee who nonetheless could not grasp the necessity of the new birth. Pastor Rockhill shows how Jesus upends the Pharisaic framework, which presumed entrance into the kingdom of God through natural descent from Abraham and diligent law-keeping. Against this, Christ insists that no one can see or enter the kingdom unless born of the Spirit. Tracing the Old Testament witness of Ezekiel 36-37, Psalm 51, and Jeremiah 31, the sermon underscores that this transformation of a heart of stone into a heart of flesh is the sovereign gift of God, not the fruit of human works. The sermon presses on to the gospel itself, foreshadowed in the bronze serpent of Numbers 21. Just as the dying Israelites looked in faith and lived, so the Son of Man was lifted up on the cross that whoever believes in Him should not perish but have eternal life. Pastor Rockhill applies this pointedly to modern skeptics and so-called scholars who study Scripture yet reject it, warning that head knowledge without a regenerate heart leaves one perishing. He exhorts believers not to be content with knowing the truth, but by God's grace to believe it unto eternal life and to bear faithful witness to others.