Why are Old Testament stories important for understanding the gospel?

The preacher explains that every story in the Old Testament serves to reveal aspects of the gospel, as Paul indicates in Galatians 4:21-31. These narratives provide allegories that teach about God's grace and covenants. For instance, the account of Abraham, Sarah, and Hagar serves as a parallel to the covenants of law and grace. Old Testament stories, while historical, are not merely for moral lessons; they point to the person and work of Christ, helping us understand how all of scripture ultimately centers on Him and our salvation.