On one occasion the Pharisees took issue with Jesus' disciples because his disciples did not wash their hands before they ate. For out of the heart come evil thoughts, murder, adultery, sexual immorality, theft, false testimony, slander. The purpose of Jesus' coming into this world was to synchronize the way we think with the way we live. Jesus taught discipleship begins with repentance. Repentance simply means to change our minds.
Repentance has to do with renewing our minds with a new way of thinking.
Jesus knew the potential for a new and better life begins in our minds. Our lives are not going to change until we change the way we think. In the Sermon on the Mount Jesus sought to correct our actions by first teaching us how to think. The Pharisees considered adultery a physical act, but Jesus taught them to look upon someone to mentally lust was adultery. The whole process of becoming a Christian is being renewed in the spirit of our minds.