According to Cicero's Three Theories, this famous saying comes from Cicero, an ancient Roman philosopher. Cicero was an important politician, lawyer and philosopher in Rome. His works involve ethics, political philosophy, legal philosophy and other fields. This famous saying emphasizes the two sides of happiness, pointing out that happiness can have a positive impact or lead to negative behavior. He advocates that people should pursue noble happiness in reason, rather than indulging in evil happiness in the senses. This thought embodies Cicero's concern for morality and human behavior, and emphasizes the importance of reason and morality.