Epictetus's Discourses and Enchiridion are foundational texts of Stoic philosophy. They teach that the key to a good life lies in understanding what we can and cannot control. We have power over our thoughts and actions, but not external events. Therefore, we should focus on cultivating virtue, reason, and self-control, accepting what we cannot change, and detaching ourselves from external outcomes. By focusing on inner virtue and accepting the natural order of the universe, we can achieve tranquility and freedom from suffering, regardless of life's challenges. The Enchiridion is a concise summary of these principles, offering practical guidance for daily life.