In Matthew 5:27-30, Jesus deepens our understanding of righteousness by teaching that even lustful thoughts violate God’s design for purity and relationships. This reflects our call to live in a way that honors the image of God in ourselves and others, valuing the sacredness of His purposes for our bodies and desires. By addressing the heart, Jesus reveals a righteousness that transcends outward actions, inviting us to participate fully in God's good plan for humanity.