In the opening verses of 1 Corinthians 5, Paul grieves over the church because they had accepted immoral sexual practices that not even the unsaved around them would tolerate. Their hearts had grown so cold that they didn't even recognize it as sin anymore. Oddly, later in these verses, Paul goes on to talk about unleavened bread. Like the leaven that gets into the bread, sin can get into our hearts and “rise” or get “puffed up.” Turning to the Old Testament to see how unleavened bread was prepared, we are given an example of how to have an “unleavened” or pure heart. We must practice quick obedience, have honest confession and accountability with others, and allow the Holy Spirit to get into the deepest parts of our heart to reveal hidden sin.