Chuck Smith explores the true meaning of the law as presented in Matthew 5:21, emphasizing that Jesus came not to establish a new set of rules but to reveal the spirit behind the law. He contrasts the teachings of the scribes and Pharisees with Christ's deeper interpretation, highlighting that God cares about the intentions of the heart rather than mere actions. Smith encourages believers to focus on the principles of love and righteousness, rather than just adhering to the letter of the law, and to examine their relationship with God daily. The sermon calls for a transformation of the heart that leads to genuine spiritual growth and character development.