The Apostle Paul shows where God's people have failed and disappointed the Lord in the past. The Lord's people have fallen into idolatry while calling it proper worship. This is intended to sober God's people and awaken us to see that we too are prone to these temptations. The Apostle Paul interjects at the conclusion of these examples that God is faithful. How can God being faithful encourage us when we doubt his goodness? Why is it so assuring that God will keep us until the end?