Stoicism is a philosophy that originated in ancient Greece and which emphasizes the development of self-control, rationality, and detachment as a means of achieving true happiness and inner peace. Adherents of stoicism strive to live a life of virtue by accepting what they cannot control and focusing their attention on what is within their power. Key proponents of stoicism include Zeno of Citium, Epictetus, and Marcus Aurelius, and the philosophy has influenced many areas of contemporary thought, including cognitive-behavioral therapy, mindfulness practices, and personal development strategies.