One of the most well-known reformers of all time, whose name is nearly synonymous with reform, is Josiah, king of Judah. The events that God providentially brought about during his reign remarkably testify to the sovereign grace and power of God to achieve reform in and through His people. This sermon celebrates several key patterns of reform demonstrated in the reign of Josiah. Its occasion commemorates God’s providential grace in the Protestant Reformation of the sixteenth century. It uses key highlights and features of the English Reformation to illustrate one of the foundational principles of reform, namely truth over tradition.