This sermon discusses a Bible passage where Jesus warns Peter that Satan wants to test his faith and that Peter will deny knowing Jesus three times before the rooster crows. The sermon says this reveals that the Devil seeks to destroy believers' faith, but is limited by God's permission. It also shows that believers like Peter are in need of God's grace due to their own failings and overconfidence, but can be transformed through Christ's power, as happened when Peter later preached at Pentecost.