The Legend of the Broken Leg
Legend says that while Epictetus was still a slave, his master cruelly twisted his leg, and he said calmly and without fear, "You will break it." The master, heedless, kept up the pressure and indeed broke his leg, and he said only, "Did I not tell you so?" — an anecdote hard to verify but vividly illustrating the extreme practice of his "dichotomy of control" philosophy, keeping a detached attitude toward "things not in our control" such as the body.
The "Dichotomy of Control"
Epictetus opened the Enchiridion by proposing: "Of things in the world, some are within our power, and some are not… Within our power are our judgment, will, desire, and aversion — in a word, all our own doings; not within our power are our body, property, reputation, and office — in a word, all that is not our own doing." This concise framework of dichotomy is still the core methodology by which Stoicism is widely applied in the modern fields of self-help and psychology.