He also advised his listeners to “pay attention to your enemies, for they are the first to discover your mistakes.”
Such is the madness of men, he said, that they choose to be miserable when they have it in their power to be content.
The Stoics’ interest in logic is a natural consequence of their belief that man’s distinguishing feature is his rationality.
Rather, Stoic tranquility was a psychological state marked by the absence of negative emotions, such as grief, anger, and anxiety, and the presence of positive emotions, such as joy.