As a young man, the slave Epictetus was horribly mistreated by his owner. One day the latter twisted his leg with remarkable cruelty.
"If you continue to do that," Epictetus declared, "you will break my leg." Sure enough, his master, ignoring his pleas, had soon twisted and broken Epictetus' limb. "Didn't I tell you," he mildly asked, "that you would break my leg?"