In this first part of a three-part series, Pastor Marc delves into Jesus' teachings from Matthew 15:10-20, focusing on the critical connection between the heart and the words we speak. This sermon centers on identifying the issue—the fact that what comes out of our mouths reflects the true condition of our hearts. Pastor Marc explores how behaviors like gossip, slander, and false testimony defile us and provide insight into our spiritual health. Through this message, we begin to understand the root of our heart disease and how we can begin to address it. The next two parts of the series will focus on the diagnosis of heart disease and the treatment needed to achieve a heart that honors God.