It is often easy to limit our view of our sinfulness to the external. If we could change our actions, then we could feel better about being good people who occasionally mess up rather than being sinners who have no hope to fix ourselves. That is what the Pharisees thought. In this passage, Jesus teaches that our sin is not limited to what we do or the external, but sin starts in the heart, at the core of who we are… this is why we need a Savior.