In this episode of Christendom and the World, Pastor Andrew Preus takes a deep look at the hardening of hearts—how it happens, why it's dangerous, and how Christians can guard against it. Using vivid examples from both the Old and New Testaments, he shows how even those who champion pure doctrine can fall into hypocrisy when God's Word is treated as nothing more than a set of rules. Pastor Preus also addresses the impact of scandals within the church—how they can shake faith, breed cynicism, and tempt believers to downplay or even abandon sound teaching altogether. Rather than letting these challenges rob us of the joy of the Gospel, he encourages us to see pure doctrine for what it truly is: the life-giving truth of Christ crucified, a treasure meant to bring rest for our souls and shape every part of our lives.