"Works of ancient philosophy are focused more on the psyche’s health (or eudaimonia) than its illness. Nonetheless, there are hints that just as a unified soul is one that is healthy (as well as rational and virtuous), a soul lacking unity will be disturbed, or mad. Offering an account of the harmonious soul, whose rational and non-rational elements achieve a unified whole, Aristotle leaves us a picture of the warring and fractured state of an unhealthy soul, for example."